1966 Cadillac DeVille Spark Plugs

Name: 8Mm Super Stock Graphite Uni
Brand: Accel
SKU: 4040B
Price: 71.99 USD
Rating: 4.0 (2 reviews)

Keep Your 1966 Cadillac DeVille in Top Shape with Quality Spark Plugs

Whether you’re repairing or upgrading your Spark Plug, using high-quality parts is key to keeping your 1966 Cadillac DeVille looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Spark Plug Wire Set Cut To Fits and Spark Plugs. Whether you’re replacing a damaged part or enhancing your truck’s style and protection, you’ll find exactly what you need to get the job done right.

Top-Rated Spark Plugs from Trusted Brands

Looking for a reliable Spark Plug? We’ve got you covered with options from brands you know and trust like Champion, NGK, and Autolite. For example, Champion Spark Plugs start at just $3.79 with an average 4.7 star rating. NGK and Autolite offer similar pricing and quality, backed by strong customer feedback. With over 82 reviews and a solid 5 star average, you can shop with confidence knowing other Cadillac DeVille owners approve.

Competitive Prices and Extensive Inventory

The average price for a 1966 Cadillac DeVille Spark Plug at Advance Auto Parts is around $20.80, with a range that starts at $3.79 and goes up to $99.99. With 15 options in stock from 7 trusted brands, finding the right fit is easy. Popular picks like Copper Core Spark Plug: Reliable Performance & Durability, DiamondFIRE Spark Plug: More Power & Fuel Efficiency, and V-Power Nickel Spark Plug (XR5): Enhanced Ignitability & Performance start at just $6.29 and offer a great balance of form and function.

Explore Related Parts

While you’re upgrading or replacing your Spark Plug, don’t forget to check out other key components like Ignition Boots and Ignition Coils and Boots. At Advance Auto Parts, we’re here to help you keep your 1966 Cadillac DeVille in peak condition, inside and out.

Looking for the perfect Spark Plug for your 1966 Cadillac DeVille? You’re in the right place. Below, you’ll find links to various types of Spark Plugs that fit your vehicle. At Advance Auto Parts, we offer only the highest quality OEM and aftermarket Spark Plugs, ensuring durability and a precise fit for your Cadillac DeVille. Whether you’re driving a 1966 model or another popular model year like 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, and 2005, we’ve got you covered. Purchasing Spark Plugs from Advance Auto Parts is a smart choice, giving you access to trusted brands and parts built to perform. Below, you’ll find links to various types of Spark Plugs that fit your vehicle.

Essential 1966 Cadillac DeVille Spark Plugs

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$71.99

ACCEL’s SuperStock 4000 series spark plug wire sets are designed to upgrade an OE ignition system for high-spark delivery levels for street driven applications. The 450 degree F rated silicone jacket is extruded over a tightly woven, rugged fiberglass braid. The braid is applied over high dielectric strength EPDM (Ethylene Propylene Diene Monomer) inner insulation for ignition wire performance that exceeds SAE specifications.

Product Features:

7mm And 8mm High Gloss Silicone Jacket
450 F Rated Silicone Jacket
Stainless Steel Plug Terminals
RFI Suppression For Street Driven Applications
Custom-fit Universal And Import Coverage
High-strength Fiberglass Braid Construction
Pre And Post HEI Vehicles

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$99.99

The traditional ACCEL combination of yellow wire and red spark plug boots has been added to these SuperStock Spiral Core 5000 Series wire sets, which feature color-matched wire and spark plug boots in blue, black, and red. With only 500 ohms/ft. of resistance, more ignition energy can reach the spark plug, producing a longer-lasting, hotter spark flame kernel. The results is higher performance through improved efficiency, quicker throttle response, and reduced emissions. This 8mm wire’s double silicone construction is rated to 550 degrees F. The high-gloss wire jacket resists moisture, chemicals, and heat extremes for longer life and great looks. The fiberglass braid adds greater pull strength and terminal retention, while the stainless steel spark plug terminals provide excellent long life, electrical conductivity, and corrosion resistance. Both universal and custom-fit applications are available for early and late model cars and trucks.

Product Features:

500 Ohms/ft Of Resistance
550 F Rated Silicone Jacket
Stainless Steel Plug Terminals
High RFI Suppression For Street And Strip Use
Universal And Import Coverage
High-strength Fiberglass Braid Construction
Pre And Post HEI Vehicles
8mm High Gloss Silicone Jacket

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$7.99

This spark plug non fouler is designed for easy installation on specified vehicles to protect spark plugs from fouling and damage. It is engineered for durability and reliable performance.

Product Features:

Direct replacement – this spark plug non fouler is designed for easy installation to protect spark plugs from fouling and damage on specified vehicles
Ideal solution – this non-fouler preserves spark plug life and is a reliable replacement for an original non-fouler that has failed due to corrosion
Durable construction – made from quality components to ensure reliable performance and a long service life
Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience

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$7.49

NGK V-Power spark plugs offer reliable performance and improved ignitability over standard nickel plugs. Engineered specifically for OE applications, the special V-cut nickel alloy center electrode and concave ground electrode of NGK’s V-Power spark plug increases ignitability providing quicker starts and smoother idle. NGK’s legendary high grade alumina silicate ceramic creates a stronger insulator for optimal dielectric performance. Trivalent metal plating ensures superior anti-corrosion and anti-seizing properties.

Product Features:

ACTUAL OE or EQUIVALENT DESIGN: OEM quality construction nickel alloy center electrode with V-groove provides consistent performance
RECOMMENDED USAGE: Best for vehicles with OE nickel alloy plugs, not recommended on vehicles with factory precious metal plugs
NGK’s OE CERAMIC TECHNOLOGY: High grade alumina silicate ceramic creates a stronger insulator for optimal dielectric performance
SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
COLD-ROLLED THREADS: Prevents cross-threading and damage to cylinder heads
TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
Enhanced Ignitability: The V-cut nickel alloy center electrode and concave ground electrode design of NGK V-Power spark plugs provide quicker starts and smoother idle.
OE Application Specific: Engineered specifically for Original Equipment (OE) applications, ensuring compatibility and reliable performance.
V-Groove Tip Design: The unique V-Groove tip design of the TR55 model enhances ignitability and overall engine performance.
Lower Emissions: The NGK Laser Platinum Spark Plug contributes to lower emissions, supporting a cleaner and more environmentally friendly driving experience.

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$4.29

Autolite Copper spark plugs are designed to provide reliable performance and quick starts, ensuring your vehicle meets its power and efficiency demands. Featuring a copper core center electrode, these spark plugs excel in thermal control and resist fouling, making them a dependable choice for consistent ignition. The high nickel alloy center and ground electrodes enhance durability, offering an extended lifespan even under demanding conditions. With a high alumina multi-rib ceramic insulator, these plugs deliver superior thermal conductivity and insulation, boosting strength and reliability. The nickel-plated shell resists corrosion, ensuring long-lasting performance. Designed with a standard center electrode and mid-projection for optimal spark delivery, these spark plugs are built to meet regular-grade requirements. The tapered seat design and integrated resistor further enhance functionality, making them a versatile and durable option for a wide range of applications.

Product Features:

The copper core center electrode aids in thermal control and improves resistance to fouling.
Its specially engineered high nickel alloy center and ground electrode provides extended life.
The high alumina multi-rib ceramic insulator provides thermal conductivity and superior insulation for increased strength.
Designed with a nickel-plated shell that is corrosion resistant to provide increased durability for extended periods.
The integrated resistor minimizes electrical interference, ensuring consistent and reliable ignition performance.

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$6.99

ACTUAL OE or EQUIVALENT DESIGN: OEM quality construction nickel alloy center electrode with V-groove provides consistent performance
RECOMMENDED USAGE: Best for vehicles with OE nickel alloy plugs, not recommended on vehicles with factory precious metal plugs
NGK’s OE CERAMIC TECHNOLOGY: High grade alumina silicate ceramic creates a stronger insulator for optimal dielectric performance
SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
COLD-ROLLED THREADS: Prevents cross-threading and damage to cylinder heads
TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal

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$6.29

ACDelco Professional Conventional Spark Plugs are designed for reliability and efficient performance, and are a high quality replacement for many vehicles on the road today. Their high-quality copper cores and outstanding suppression characteristics deliver reliable performance. They are also available for Marine applications. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function.

Product Features:

Black Onyx coating helps reduce corrosion
Copper core provides great heat transfer and helps maximize plug durability
Ribbed suppressor seal extends resistance and helps prevent spark ‘flash over’ and misfires
Nickel-chrome alloy sheathing helps prevent corrosion on center electrode
Available for use in Marine applications
Some ACDelco Gold parts may have formerly appeared as ACDelco Professional
Premium aftermarket replacement part
Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models

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$5.79

The Platinum TT Spark Plug with a Twin-Tip design is engineered to deliver superior combustion efficiency by enabling faster flame propagation for a more complete burn. Featuring a durable platinum center electrode tip, this spark plug ensures long-lasting performance and reliable ignition under various driving conditions. Its flat seat type provides a secure fit, enhancing overall engine stability and performance. Designed for precision and efficiency, this spark plug not only improves fuel combustion but also contributes to better fuel economy and reduced emissions. Ideal for drivers seeking enhanced engine responsiveness and durability, it offers exceptional value and reliability for your vehicle.

Product Features:

Twin-Tip design promotes faster flame propagation, ensuring a more complete and efficient fuel burn.
Durable platinum center electrode tip enhances longevity and provides consistent ignition performance.
Flat seat type ensures a secure fit, contributing to improved engine stability and overall performance.
Optimized combustion efficiency supports better fuel economy and reduced emissions for eco-conscious driving.
Engineered for enhanced engine responsiveness, delivering reliable performance under various driving conditions.

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$13.99

The Iridium Power Spark Plug features the world’s smallest iridium center electrode at just 0.4mm, delivering unmatched spark precision for maximum combustion efficiency. Engineered with patented 360-degree laser welding, it ensures durability and reliability even under extreme conditions, withstanding temperatures over 4000 Deg F. The U-groove and taper-cut ground electrode design enhances flame propagation, optimizing engine performance. Its burnished nickel plating provides superior resistance to high temperatures and corrosion, making it ideal for long-term use. Designed for a wide range of applications, including classic and collector cars, this spark plug offers superior performance with increased horsepower and improved fuel efficiency. Requiring 5,000 volts less to fire compared to conventional plugs, it ensures reliable starts and fewer misfires, even under heavy loads. Constructed with a durable iridium center electrode tip and a flat seat type, the Iridium Power Spark Plug guarantees long-lasting performance, making it a top choice for drivers seeking efficiency, power, and reliability.

Product Features:

World’s smallest Iridium Center Electrode (0.4mm) for improved spark for maximum combustion
Patented 360-degree laser welding assembly process
U-groove and taper cut ground electrode to maximize flame propagation.
Withstands temperatures greater than 4000 degree Fahrenheit
Burnished nickel plating for high temperature endurance and superior corrosion resistance
Wide range of part numbers for thousands of applications, including classic and collector cars
Iridium Power
Superior Performance: Patented technology allows the Iridium Power plug to outperform any other spark plug on the market, delivering more horsepower and better fuel efficiency.
Low Voltage Requirement: Requires 5,000 volts less to fire compared to conventional spark plugs, making it highly efficient and reliable under extreme conditions.
Enhanced Engine Starts: Experience faster and easier engine starts with fewer misfires, even under heavy loads, thanks to the advanced design of the DENSO Iridium Power spark plug.
Durable Iridium Material: Constructed with a durable iridium center electrode tip and a flat seat type, ensuring long-lasting performance and reliability.

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$12.99

The Iridium TT Spark Plug delivers the perfect blend of durability and high performance, making it an ideal choice for drivers seeking reliability and power. Featuring a 0.4mm Iridium center electrode – the world’s smallest diameter – it maximizes firing potential, while the 0.7mm needle tip ground electrode promotes higher spark energy and minimizes heat quenching. Crafted with DENSO’s patented Iridium-Rhodium alloy formula, this spark plug boasts the highest concentration of Iridium for unmatched durability. Its 360-degree laser welding process ensures a robust bond and structural integrity, even under extreme conditions exceeding 4000 degrees Fahrenheit. Designed with a flat seat type for a secure fit, it offers consistent performance throughout its lifespan. Beyond power and torque, the Iridium TT enhances fuel economy and reduces emissions, allowing you to drive around the Earth over four times with improved efficiency. This spark plug is the ultimate solution for drivers demanding OE-style reliability combined with high-performance endurance.

Product Features:

0.4mm Iridium Center Electrode: World’s Smallest Diameter that maximizes firing potential
0.7mm Needle Tip Ground Electrode: Promotes higher spark energy and less heat quenching
DENSO Patented Optimized Iridium-Rhodium Alloy Formula: Highest concentration of Iridium vs. competitors for greater durability
DENSO Patented 360 degree laser welding process: Ensuring exceptional quality bond and structural strength with the Iridium Center Electrode
Durability of an OE style plug combined with Power and Torque of high performance.
Withstands temperatures greater than 4000 degree Fahrenheit
Iridium TT
Enhanced Fuel Economy and Lower Emissions: Drive around the Earth over 4 times with improved fuel efficiency and reduced emissions.
Reliable and Durable: The flat seat type design ensures a secure fit and consistent performance throughout its lifespan.

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$6.29

ACDelco GM Original Equipment Conventional Spark Plugs are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These Conventional Spark Plugs are designed for reliability and efficient performance, and are a high quality replacement for many vehicles on the road today. Their high-quality copper cores and outstanding suppression characteristics deliver reliable performance. They are also available for Marine applications. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function. ACDelco GM Original Equipment parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional.

Product Features:

GM regularly updates production and service part designs to integrate new materials and technologies
Designed with a high-quality copper core for enhanced conductivity and heat control, ensuring optimal engine performance.
Outstanding suppression characteristics minimize radio frequency interference, providing a smoother driving experience.
Suitable for both automotive and marine applications, offering versatile performance solutions.

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$12.99

The Iridium Power Spark Plug (ITF16) is engineered for unmatched performance and efficiency, featuring the world’s smallest 0.4mm Iridium Center Electrode for enhanced spark and maximum combustion. Its patented 360-degree laser welding ensures durability, while the U-groove and taper-cut ground electrode optimize flame propagation for superior ignition. Built to withstand extreme temperatures exceeding 4000 Deg F, this spark plug is burnished with nickel plating for exceptional corrosion resistance and high-temperature endurance. Designed for a wide range of applications, including classic and collector cars, it delivers superior performance with more horsepower, quicker starts, and fewer misfires under heavy loads. The advanced iridium technology enhances fuel efficiency, making it a cost-effective choice, while its low voltage requirement ensures reliable ignition with reduced energy consumption. Whether you’re seeking maximum power or improved fuel economy, this spark plug is built to perform under the most demanding conditions.

Product Features:

World’s smallest Iridium Center Electrode (0.4mm) for improved spark for maximum combustion
Patented 360-degree laser welding assembly process
U-groove and taper cut ground electrode to maximize flame propagation.
Withstands temperatures greater than 4000 degree Fahrenheit
Burnished nickel plating for high temperature endurance and superior corrosion resistance
Wide range of part numbers for thousands of applications, including classic and collector cars
Iridium Power
Superior Performance: Designed for maximum performance under extreme conditions, this spark plug delivers more horsepower, faster and easier starts, and fewer misfires under heavy loads.
Enhanced Fuel Efficiency: The advanced iridium technology of the DENSO Iridium Power spark plug contributes to better fuel efficiency, making it an economical choice for your vehicle.
Low Voltage Requirement: This spark plug requires 5,000 volts less to fire compared to conventional spark plugs, ensuring reliable ignition with lower energy consumption.

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$4.49

ACDelco is a global leader in automotive replacement parts and related services and offers quality aftermarket products for most makes and models, including General Motors, Ford, Chrysler, Toyota and Honda, plus many original equipment service replacement parts. ACDelco products can be found in more than 100 countries located on six of the seven continents and are sourced globally to meet the needs of the local markets, including “maintenance” parts commonly replaced during the lifetime of a vehicle (e.g., batteries, oil filters, air filters, wiper blades, shocks and brakes), as well as “repair” parts (e.g., alternators, radiators, chassis and heating/cooling components). ACDelco offers more than 80,000 parts across 37 product lines. ACDelco has over 100 years of experience in the automotive industry and is a brand of GM Customer Care and Aftersales, a division of General Motors. ACDelco employs a two- or three-tiered distribution model, utilizing a network of appointed wholesale distributors to service independent installers, ACDelco independent service centers, retail and fleet customers.

Product Features:

The kind of firepower you expect from ACDelco. The spark plug is what started it all for us, and with over 100 years of innovation behind each spark plug, you know they’re going to be great.
Designed for enhanced durability and consistent performance, ensuring reliable ignition over an extended lifespan.
Engineered to meet the needs of a wide range of vehicle makes and models, including General Motors, Ford, Toyota, and Honda.

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$4.99

Champion Double Platinum Power spark plugs are engineered for enhanced durability and performance, making them a premium choice for reliable ignition. Featuring a platinum fine-wire center electrode and platinum pad ground electrode, these spark plugs deliver greater wear resistance and sharper spark focus for consistent ignitability. The V-trimmed ground electrode ensures precise spark delivery, while the exclusive Heat-Active alloy optimizes electrode temperature under all engine loads, maintaining stable operation. Designed as a standard replacement, these spark plugs are equipped with a tapered seat and resistor type for seamless compatibility with a wide range of vehicles. Whether you’re seeking improved engine efficiency or long-lasting performance, Champion Double Platinum Power spark plugs provide exceptional value with their advanced materials and innovative design.

Product Features:

Double Platinum Power – Premium Spark Plug. More Powerful Performance.
Platinum center and ground electrode for greater wear resistance
Maintains stable operating temperature under all engine loads
Fine-wire center electrode for greater ignitability
V-trimmed ground electrode promotes sharper spark focus
Heat-Active alloy allows electrodes to reach optimal temperature

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$3.99

Autolite Copper spark plugs are crafted to deliver reliable performance and quick starts, ensuring your vehicle meets its power demands with ease. Featuring a copper core center electrode, these spark plugs excel in thermal control and resist fouling, while the high nickel alloy center and ground electrodes provide extended life and durability. The high alumina multi-rib ceramic insulator enhances thermal conductivity and insulation, offering superior strength under demanding conditions. Designed with a corrosion-resistant nickel-plated shell, these spark plugs are built to withstand extended use. With a standard center electrode design, mid projection, and tapered seat type, they are engineered for compatibility and consistent performance. The inclusion of a resistor further enhances functionality, making these spark plugs a dependable choice for regular-grade applications.

Product Features:

The copper core center electrode aids in thermal control and improves resistance to fouling.
Its specially engineered high nickel alloy center and ground electrode provides extended life.
The high alumina multi-rib ceramic insulator provides thermal conductivity and superior insulation for increased strength.
Designed with a nickel-plated shell that is corrosion resistant to provide increased durability for extended periods.
The resistor integration enhances functionality by minimizing electrical interference, ensuring consistent and reliable performance.

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$6.29

ACDelco Gold (Professional) Conventional Spark Plugs are a high quality alternative to Original Equipment (OE) parts. These conventional spark plugs are designed for reliability and efficient performance. Their high-quality copper cores and outstanding suppression characteristics deliver reliable performance. They are also available for Marine applications. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function. ACDelco Gold (Professional) parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by General Motors. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional.

Product Features:

Black Onyx coating helps reduce corrosion
Copper core provides great heat transfer and helps maximize plug durability
Available for use in Marine applications
Some ACDelco Gold parts may have formerly appeared as ACDelco Professional
Premium aftermarket replacement part
Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models
Nickel Center Electrode Tip: Features a nickel center electrode tip for enhanced conductivity and performance.
Resistor Type: Equipped with a resistor to help reduce radio frequency interference, ensuring smooth engine operation.

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$6.99

ACTUAL OE or EQUIVALENT DESIGN: OEM quality construction nickel alloy center electrode with V-groove provides consistent performance
RECOMMENDED USAGE: Best for vehicles with OE nickel alloy plugs, not recommended on vehicles with factory precious metal plugs
NGK’s OE CERAMIC TECHNOLOGY: High grade alumina silicate ceramic creates a stronger insulator for optimal dielectric performance
SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
COLD-ROLLED THREADS: Prevents cross-threading and damage to cylinder heads
TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
Enhanced Ignitability: The V-cut nickel alloy center electrode and concave ground electrode design of NGK V-Power spark plugs provide quicker starts and smoother idle.
OE Application Specific: Engineered specifically for Original Equipment (OE) applications, ensuring compatibility and reliable performance.
V-Groove Tip Design: The unique V-Groove tip design of the GR45 model enhances ignitability and overall engine performance.

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$4.49

Standard Spark Plug (AGS32C) by Motorcraft is the ultimate choice for reliable performance and durability, specifically engineered to meet Ford’s stringent standards. Designed as original equipment for Ford, Lincoln, and Mercury vehicles, these spark plugs ensure an exact fit while delivering enhanced durability, reduced fuel consumption, and optimized emissions. Crafted with high-quality nickel for both the center and ground electrode tips, they resist oxidation and arc erosion, ensuring long-lasting performance. The multi-rib insulator effectively prevents misfires, while the design helps avoid false check engine lights, providing peace of mind for drivers. With service intervals of up to 100,000 miles, these spark plugs offer exceptional value and convenience. Backed by Motorcraft’s Service Parts Warranty, they are ideal for domestic and import cars and trucks of all sizes, making them a versatile solution for almost any application. Trust Motorcraft to deliver the same reliable ignition components your vehicle was manufactured with.

Product Features:

Motorcraft spark plugs are matched to specific engines to provide enhanced durability, eliminate misfires, reduce fuel consumption and optimize emissions.
Backed by Motorcraft’s Service Parts Warranty
Exact fit for Ford, Lincoln and Mercury vehicles
Resistant to oxidation and arc erosion.
Multi-rib insulator protects against misfire.
Service intervals of up to 100,000 miles.
Motorcraft Spark Plugs are designed with high quality materials to provide reliable performance for almost any application.
Motorcraft Spark Plugs are what was in the vehicle when it was manufactured
Motorcraft ignition components help prevent false check engine lights.

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$8.49

The Champion Iridium Spark Plug is engineered for maximum performance and longevity, making it a premium choice for your vehicle. Featuring a fine-wire iridium center electrode and a V-trimmed iridium-platinum ground electrode, this spark plug ensures sharper spark focus and greater ignitability for optimal engine efficiency. Its Heat-Active alloy allows the electrodes to quickly reach and maintain stable operating temperatures under all engine loads, ensuring consistent performance. Designed with a tapered seat and built-in resistor, it delivers reliable operation while reducing interference. The iridium center electrode is crafted for maximum durability and extended life, making it ideal for high-performance applications. Whether you’re looking to enhance your vehicle’s ignition system or maintain peak engine performance, this spark plug offers exceptional value and reliability.

Product Features:

Champion Iridium – Maximum Performance. Premium Spark Plug
Iridium center electrode delivers maximum life
Fine-wire center electrode and V-trimmed for greater ignitability
V-trimmed ground electrode promotes sharper spark focus
Maintains stable operating temperature under all engine loads
Heat-Active alloy allows electrodes to reach optimal temperature quickly

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$8.49

Champion Iridium spark plug is engineered for drivers who demand peak performance and durability. Featuring a fine-wire iridium center electrode and a platinum-enhanced ground electrode, this premium spark plug ensures sharper spark focus and greater ignitability, delivering maximum engine efficiency. The V-trimmed ground electrode design promotes consistent performance, while the Heat-Active alloy allows the electrodes to quickly reach and maintain optimal operating temperatures under all engine loads. Built with a tapered seat type and resistor technology, it provides reliable performance and compatibility with a wide range of vehicles. Designed for longevity, the iridium center electrode ensures extended service life, making it a perfect choice for those seeking high-grade, performance-oriented spark plugs.

Product Features:

Champion Iridium – Maximum Performance. Premium Spark Plug
Iridium center electrode delivers maximum life
Fine-wire center electrode and V-trimmed for greater ignitability
V-trimmed ground electrode promotes sharper spark focus
Maintains stable operating temperature under all engine loads
Heat-Active alloy allows electrodes to reach optimal temperature quickly

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$9.99

The Iridium Power Spark Plug features the world’s smallest Iridium Center Electrode at just 0.4mm, delivering unmatched spark precision for maximum combustion efficiency. Engineered with a patented 360-degree laser welding assembly process, this spark plug ensures exceptional durability and reliability under extreme conditions. Its U-groove and taper-cut ground electrode design optimizes flame propagation, enhancing engine performance and fuel efficiency. Built to withstand temperatures exceeding 4000 Deg F, it is burnished with nickel plating for superior high-temperature endurance and corrosion resistance. Designed for versatility, it offers a wide range of part numbers to fit thousands of applications, including classic and collector cars. With its Iridium tip and tapered seat type, this spark plug is the ultimate choice for drivers seeking maximum spark energy, durability, and long-lasting performance.

Product Features:

World’s smallest Iridium Center Electrode (0.4mm) for improved spark for maximum combustion
Patented 360-degree laser welding assembly process
U-groove and taper cut ground electrode to maximize flame propagation.
Withstands temperatures greater than 4000 degree Fahrenheit
Burnished nickel plating for high temperature endurance and superior corrosion resistance
Wide range of part numbers for thousands of applications, including classic and collector cars
Iridium Power

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$3.99

Autolite Copper spark plugs are expertly crafted to ensure reliable performance and long-lasting durability for your vehicle. Featuring a copper core center electrode, these plugs excel in thermal control and resist fouling, ensuring consistent operation. The high nickel alloy center and ground electrodes are designed for extended life, while the high alumina multi-rib ceramic insulator enhances thermal conductivity and provides superior insulation for added strength. With a nickel-plated shell, these spark plugs resist corrosion, making them ideal for long-term use. The mid-projection center electrode and flat seat type ensure a precise fit, while the resistor design minimizes electrical interference. Optimized for good fuel economy, these spark plugs help you maximize mileage and efficiency. Built with regular-grade materials and nickel-tipped electrodes, they deliver dependable performance and quick starts, meeting the demands of your vehicle or application.

Product Features:

The copper core center electrode aids in thermal control and improves resistance to fouling.
Its specially engineered high nickel alloy center and ground electrode provides extended life.
The high alumina multi-rib ceramic insulator provides thermal conductivity and superior insulation for increased strength.
Designed with a nickel-plated shell that is corrosion resistant to provide increased durability for extended periods.
Good Fuel Economy: Designed to optimize fuel efficiency, this spark plug helps you get the most out of every gallon.

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$2.99

The Copper Plus Spark Plug delivers dependable performance and durability, making it a reliable choice for maintaining optimal engine function. Featuring a copper core center electrode, it ensures enhanced conductivity and precise heat control, promoting good overall wear and extending the spark plug’s lifespan. Built to ISO and SAE Standards, this spark plug guarantees proven performance and superior corrosion resistance, even in demanding conditions. Its nickel center electrode tip and tapered seat design further enhance reliability and engine efficiency, making it an excellent standard replacement option. With a resistor type design and robust materials, this spark plug is engineered to provide consistent ignition and long-lasting durability, ensuring your vehicle runs smoothly mile after mile.

Product Features:

Copper Plus – Dependable Performance and Durability
Copper core center electrode allows for accurate control of heat range for longer life
Superior corrosion resistance
Built to ISO and SAE standards for proven performance
Built to ISO and SAE standards for proven performance
Enhanced Conductivity and Heat Control: The Champion Copper Plus Spark Plug features a copper core electrode that provides increased conductivity and heat control, ensuring good overall wear and extending the spark plug’s life.
Reliable Nickel Center Electrode Tip: Featuring a nickel center electrode tip and a tapered seat type, this spark plug enhances reliability and ensures optimal engine performance.

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$10.49

Direct replacement – this spark plug non fouler is designed for easy installation to protect spark plugs from fouling and damage on specified vehicles
Ideal solution – this non-fouler preserves spark plug life and is a reliable replacement for an original non-fouler that has failed due to corrosion
Durable construction – made from quality components to ensure reliable performance and a long service life
Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience

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$3.49

The U-Groove Spark Plug with its patented U-groove ground electrode design ensures superior ignitability, allowing your engine to fire leaner mixtures for enhanced efficiency and performance. Built with a durable nickel center electrode tip, it delivers long-lasting performance while improving fuel consumption and emission gas purification. Precision machine-rolled threads minimize the risk of seizing or cross-threading, making it ideal for use in delicate aluminum heads. Designed to last twice as long as most conventional plugs, this spark plug is 100% pre-fired to guarantee reliable operation from the start. Its tapered seat type ensures a secure fit, and with a wide range of part numbers available, its compatible with thousands of applications, including classic and collector cars. Whether you’re maintaining a daily driver or restoring a vintage vehicle, this spark plug offers OE performance and exceptional value.

Product Features:

Patented U-groove ground electrode design fires leaner mixtures than conventional plugs
Precision machine-rolled threads reduce seizing and cross-threading in delicate aluminum heads
Wide range of part numbers for thousands of applications, including classic and collector cars
Lasts twice as long as most conventional plugs
100 percent pre-fired to assure reliable operation
U-Groove Conventional
Durable Nickel Center Electrode Tip: Provides long-lasting performance and improved efficiency in emission gas purification and fuel consumption.

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$8.49

The Spark Plugs are the product of years of fundamental research in the combustion field. The unique patented electrode configuration of these new The spark plugs increases the amount of combustion pressure created during each power stroke of an engine, which results in a marked increase in power output, fuel economy, and reduced emissions in all gasoline engines. E3.46 is a 14mm, 0.750 reach plug with a gasket seat. It fits a wide variety of applications from the 60s to early 90s, especially import. E3.46 is widely stocked in automotive retail stores. The automotive plugs have three legs securing the Diamond FIRE electrode to the shell. This allows for excellent heat transfer, and helps to create more turbulence in the cylinder. The patented Diamond FIRE side wire is proven to increase power, reduce fuel consumption and improve hydrocarbon emissions in long-term use.

Product Features:

E3’s Diamond Fire edge to edge ground electrode provides maximum performance with increased efficiency and a faster more complete burn.
Smoother Acceleration & Idle – The faster flame initiated by the spark plug results in a more complete burn of the ingested fuel charge. More pressure is created against the piston more fuel is put to work
Energy – Power output improved up to 6% on average in the typical operating ranges. Results will vary.
Efficiency – The “diamond shaped” side wire electrode projects the combustion spark in a way that more quickly ignites the air/fuel mixture, thereby creating a significantly faster and larger flame kernel. The result is that more fuel is put to work durin
E3’s patented Diamond Fire Technology provides a cleaner burning combustion, which translates into fuel savings and reduced engine carbon deposits
The Spark Plugs are pre-gapped at the factory and cannot be adjusted.
Wide Compatibility: The E3.46 spark plugs are 14mm with a 0.750 reach and a gasket seat, making them suitable for a wide range of applications from the 1960s to early 1990s, especially for import vehicles.
Widely Available: The E3.46 spark plugs are widely stocked in automotive retail stores, ensuring easy availability for consumers.

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$7.99

The Champion Iridium Spark Plug is engineered for maximum performance and durability, making it the ultimate choice for high-performance engines. Featuring a fine-wire iridium center electrode and a platinum-enhanced ground electrode, this premium spark plug ensures sharper spark focus and greater ignitability for optimal engine efficiency. The V-trimmed ground electrode design enhances spark precision, while the Heat-Active alloy allows the electrodes to quickly reach and maintain stable operating temperatures under all engine loads. Built with a tapered seat and resistor type, it delivers consistent performance and reduces interference. Designed for longevity, the iridium center electrode ensures extended service life, making it a reliable and cost-effective solution for demanding driving conditions. Whether you’re looking to enhance your vehicle’s ignition system or maintain peak engine performance, this Champion spark plug is the perfect upgrade.

Product Features:

Champion Iridium – Maximum Performance. Premium Spark Plug
Iridium center electrode delivers maximum life
Fine-wire center electrode and V-trimmed for greater ignitability
V-trimmed ground electrode promotes sharper spark focus
Maintains stable operating temperature under all engine loads
Heat-Active alloy allows electrodes to reach optimal temperature quickly

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$5.99

NGK Standard spark plugs (in the iconic NGK ‘yellow box’ packaging) are a proven OE cornerstone and technology customers have relied on for decades. Engineered specifically for OE applications, NGK Standard spark plugs provide OE quality nickel alloy reliable performance and design. NGK’s legendary high grade alumina silicate ceramic creates a stronger insulator for optimal dielectric performance, while triple gasket sealing prevents combustion gas leakage. Solid 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges. Trivalent metal plating ensures superior anti-corrosion and anti-seizing properties.

Product Features:

ACTUAL OE or EQUIVALENT DESIGN: OEM quality construction nickel alloy center electrode provides consistent performance
RECOMMENDED USAGE: Best for vehicles with OE nickel alloy plugs, not recommended on vehicles with factory precious metal plugs
NGK’s OE CERAMIC TECHNOLOGY: High grade alumina silicate ceramic creates a stronger insulator for optimal dielectric performance
SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
COLD-ROLLED THREADS: Prevents cross-threading and damage to cylinder heads
TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
Triple Gasket Sealing: Prevents combustion gas leakage, ensuring efficient engine performance.

Popular 1966 Cadillac DeVille Spark Plugs Categories

Spark Plugs

Spark Plug Wire Set Cut To Fits

Most Popular Spark Plug Wire Set Cut To Fits for 1966 Cadillac DeVilles

Enhance your 1966 Cadillac DeVille with one of the 2 Spark Plug Wire Set Cut To Fits we have in stock, starting at just $71.99.

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$71.99

7mm And 8mm High Gloss Silicone Jacket
450 F Rated Silicone Jacket
Stainless Steel Plug Terminals
RFI Suppression For Street Driven Applications
Custom-fit Universal And Import Coverage
High-strength Fiberglass Braid Construction
Pre And Post HEI Vehicles

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$99.99

500 Ohms/ft Of Resistance
550 F Rated Silicone Jacket
Stainless Steel Plug Terminals
High RFI Suppression For Street And Strip Use
Universal And Import Coverage
High-strength Fiberglass Braid Construction
Pre And Post HEI Vehicles
8mm High Gloss Silicone Jacket

Best-Selling 1966 Cadillac DeVille Spark Plugs

Upgrade your DeVille with one of our 13 best-selling Spark Plugs, earning an average 4.82 stars rating across 75 reviews.

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$8.49

The Premium DiamondFire Automotive Spark Plug is engineered to deliver exceptional performance and efficiency for your vehicle. Featuring E3’s patented Diamond Fire edge-to-edge ground electrode, it ensures a faster, more complete burn for smoother acceleration and idle. The innovative “diamond-shaped” side wire electrode enhances combustion by quickly igniting the air/fuel mixture, resulting in a larger and faster flame kernel. This translates to improved power output – up to 6% on average – and better fuel efficiency, saving you money while reducing engine carbon deposits. Constructed with durable nickel center and ground electrode tips, this spark plug is built to last. Its gasket seat type ensures a secure fit, and the pre-gapped design eliminates the need for adjustments, making installation hassle-free. With its advanced technology, this spark plug not only boosts engine performance but also contributes to a cleaner, more efficient combustion process.

Product Features:

E3’s Diamond Fire edge to edge ground electrode provides maximum performance with increased efficiency and a faster more complete burn.
Smoother Acceleration & Idle – The faster flame initiated by the spark plug results in a more complete burn of the ingested fuel charge. More pressure is created against the piston more fuel is put to work
Energy – Power output improved up to 6% on average in the typical operating ranges. Results will vary.
Efficiency – The “diamond shaped” side wire electrode projects the combustion spark in a way that more quickly ignites the air/fuel mixture, thereby creating a significantly faster and larger flame kernel. The result is that more fuel is put to work durin
E3’s patented Diamond Fire Technology provides a cleaner burning combustion, which translates into fuel savings and reduced engine carbon deposits
The Spark Plugs are pre-gapped at the factory and cannot be adjusted.

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$6.99

ACTUAL OE or EQUIVALENT DESIGN: OEM quality construction nickel alloy center electrode with V-groove provides consistent performance
RECOMMENDED USAGE: Best for vehicles with OE nickel alloy plugs, not recommended on vehicles with factory precious metal plugs
NGK’s OE CERAMIC TECHNOLOGY: High grade alumina silicate ceramic creates a stronger insulator for optimal dielectric performance
SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
COLD-ROLLED THREADS: Prevents cross-threading and damage to cylinder heads
TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
Enhanced Ignitability: The V-cut nickel alloy center electrode and concave ground electrode design of NGK V-Power spark plugs provide quicker starts and smoother idle.
OE Application Specific: Engineered specifically for Original Equipment (OE) applications, ensuring compatibility and reliable performance.
V-Groove Tip Design: The unique V-Groove tip design of the XR5 model enhances ignitability and overall engine performance.

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$3.79

The Copper Plus spark plug is engineered for dependable performance and durability, making it an ideal OE-type replacement for small engines. Featuring a copper core center electrode, it ensures precise heat control and increased conductivity, promoting longer life and consistent wear. Its nickel center and ground electrode tips, combined with a flat seat design, deliver enhanced reliability and superior performance. Built to ISO and SAE Standards, this spark plug resists fouling and offers exceptional corrosion resistance, ensuring it withstands tough conditions. Whether you’re maintaining a small engine or seeking a reliable replacement, this spark plug provides proven performance and value.

Product Features:

Copper Plus – Dependable Performance and Durability
OE type replacement plug
Resists fouling
Copper core center electrode allows for accurate control of heat range for longer life
Superior corrosion resistance
Built to ISO and SAE standards for proven performance
Increased Conductivity and Heat Control: The Champion Copper Plus Small Engine Spark Plug features a copper core electrode that enhances conductivity and heat management, ensuring good overall wear.
Enhanced Reliability: With a nickel center electrode tip material and flat seat type, this spark plug provides enhanced reliability and consistent performance for small engines.

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$4.99

Autolite Platinum spark plugs are crafted for superior performance and durability, making them ideal for older engine designs. Featuring a platinum center electrode firing tip, these spark plugs ensure quicker firing, smoother starts, and enhanced acceleration while boosting fuel efficiency. The platinum firing tip resists gap erosion, extending service life, while the high alumina ceramic insulator provides excellent thermal conductivity and insulation for added strength. A multi-rib insulator prevents flash-over, and the nickel-plated shell offers corrosion resistance for long-lasting durability. Designed with a flat gasket seat type, these spark plugs ensure a secure fit and optimal performance. With a mid-projection standard center electrode and nickel ground electrode tip, they deliver reliable ignition and consistent performance. Perfect for those seeking a performance-grade solution, Autolite Platinum spark plugs combine advanced materials and engineering to deliver value and dependability for your vehicle.

Product Features:

Engineered with a platinum firing tip that prevents gap erosion for longer service life.
Its high alumina ceramic insulator provides thermal conductivity and superior insulation for increased strength.
The multi-rib insulator prevents flash-over.
Designed with a nickel-plated shell that is corrosion resistant to provide increased durability for extended life.
Gasket Seat Type: Ensures a secure fit and optimal performance.

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$3.79

Copper Plus spark plug delivers reliable performance and durability, making it an ideal choice for small engines. Featuring a copper core center electrode, it ensures precise heat control and enhanced conductivity, promoting longer life and consistent wear. Built to ISO and SAE Standards, this OE-type replacement plug resists fouling and offers superior corrosion resistance, ensuring dependable operation in various conditions. The nickel-tipped center and ground electrodes further enhance its durability and performance, while the flat seat design ensures a secure fit. Whether you’re maintaining your equipment or replacing worn-out parts, this spark plug provides exceptional value with its proven performance and robust construction.

Product Features:

Resists fouling
Superior corrosion resistance
Dependable and proven performance
Increased conductivity and heat control for good overall wear

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$7.99

Direct replacement – this spark plug non fouler is designed for easy installation to protect spark plugs from fouling and damage on specified vehicles
Ideal solution – this non-fouler preserves spark plug life and is a reliable replacement for an original non-fouler that has failed due to corrosion
Durable construction – made from quality components to ensure reliable performance and a long service life
Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience

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$16.99

NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode’s durability is six times harder than platinum. Iridium alloy’s extremely high melting point is perfect for today’s engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.

Product Features:

SINGLE IRIDIUM TIP: Fine wire 0.6 millimeter iridium tip center electrode ensures high durability and a consistently stable spark
IRIDIUM ALLOY CENTER ELECTRODE: Iridium’s density (6x that of platinum) and extremely high melting point is perfect for modern high efficiency engines
TAPERED CUT GROUND ELECTRODE: Reduced quenching design produces outstanding ignitability, improved acceleration, fuel efficiency and durability
SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs

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$6.29

Black Onyx coating helps reduce corrosion
Copper core provides great heat transfer and helps maximize plug durability
Ribbed suppressor seal extends resistance and helps prevent spark ‘flash over’ and misfires
Nickel-chrome alloy sheathing helps prevent corrosion on center electrode
Available for use in Marine applications
Some ACDelco Gold parts may have formerly appeared as ACDelco Professional
Premium aftermarket replacement part
Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models

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$3.99

The copper core center electrode aids in thermal control and improves resistance to fouling.
Its specially engineered high nickel alloy center and ground electrode provides extended life.
The high alumina multi-rib ceramic insulator provides thermal conductivity and superior insulation for increased strength.
Designed with a nickel-plated shell that is corrosion resistant to provide increased durability for extended periods.
Good Fuel Economy: Designed to optimize fuel efficiency, this spark plug helps you get the most out of every gallon.

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$6.99

ACDelco Gold (Professional) RAPIDFIRE Spark Plugs are a high quality alternative to Original Equipment (OE) parts. These RAPIDFIRE Single Platinum Performance Spark Plugs are designed for everyday use and are a high quality replacement for many vehicles on the road today. These premium aftermarket spark plugs have high-quality suppressors that help prevent misfiring, an improved plug to boot seal, and a pure copper core for greater durability. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function. ACDelco Gold (Professional) parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by General Motors. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional.

Product Features:

Solid state suppressor, with two-piece glass and brass seal, can help reduce radio frequency interference, regulates spark energy for long electrode life, and helps protect against high combustion pressures
Pure copper core provides great heat transfer and helps maximize plug durability
Platinum on center electrode enables superior spark characteristics and can reduce voltage requirements of the ignition system
Ribless insulator helps optimize plug to boot seal
Some ACDelco Gold parts may have formerly appeared as ACDelco Professional
Premium aftermarket replacement part
Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models
High-Quality Suppressors: ACDelco Gold RAPIDFIRE Spark Plugs feature high-quality suppressors that help prevent misfiring, ensuring reliable performance for everyday use.
Improved Plug to Boot Seal: Designed with an improved plug to boot seal, these spark plugs provide a secure fit, enhancing overall engine performance and longevity.

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$51.99

ACCEL’s patented race proven spark plugs in a Shorty configuration. The overall length has been reduced 3/16 in to 3/8 in (depending on the specific spark plug) to gain critical air gap between the spark plug boot and the exhaust manifold or header tube. This helps eliminate burning the spark plug boot or dimpling the header tube. The shorter spark plug length also can make it easier to install an remove the spark plugs in certain applications where there is not a lot of room to fit a socket or move a wrench around. ACCEL Shorty Spark Plugs are made with a Copper core which is a better conductor than Platinum and Iridium. They deliver a stronger spark especially in high performance applications where high combustion pressures are present. Copper is much better at dissipating heat than other materials which lessens the chance of a misfire. ACCEL Shorty Spark Plugs are capable allowing you to open the gap exposing a larger flame kernel or close it if needed for high boost applications. All ACCEL Shorty Spark Plugs have machine rolled threads allowing for a more precise thread engagement and torque retention.

Product Features:

Eliminates Dimpling Headers For Added Clearance
Improves Spark Plug Access To Fit Socket Or Wrench
Shorter Overall Plug Length Vs. OE Style Plug
Copper Core Center Electrode
Projected Tip
Helps Eliminate Burned Spark Plug Boots
Shorty Header Spark Plug

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$4.79

Copper Plus spark plug delivers dependable performance and durability, making it a reliable choice for maintaining your vehicle’s efficiency. Featuring a copper core center electrode, it ensures precise heat control and enhanced conductivity, promoting longer life and consistent wear. The nickel-tipped center and ground electrodes provide superior corrosion resistance, ensuring optimal performance even in demanding conditions. Designed to meet ISO and SAE Standards, this spark plug guarantees proven reliability and compatibility with standard replacement needs. Its flat seat type and built-in resistor further enhance its functionality, making it a practical solution for maintaining engine performance. Whether you’re seeking durability or consistent ignition, this spark plug offers excellent value for your vehicle’s maintenance.

Product Features:

Copper Plus – Dependable Performance.
Copper core center electrode allows for accurate control of heat range for longer life
Patented TinTac and ULTRASEAL coated shell for maximum corrosion resistance
Patented SAC-9 semiconductor resistor for maximum EMI & RFI suppression
Built to ISO and SAE standards for proven performance

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$12.99

ACDelco Gold (Professional) Double Platinum Spark Plug are a high quality alternative to Original Equipment (OE) parts. With a copper core and double platinum pads on the center electrode, these plugs are designed to deliver long-lasting performance. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function. ACDelco Gold (Professional) parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by General Motors. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional.

Product Features:

One-piece, fired-in suppressor seal blends three glass types for a gas-tight seal that helps reduce radio frequency and engine interference, regulate spark plug energy, and protect against compression pressures for long life
Double platinum point pad on center and ground electrode offer excellent durability and consistent voltage demands to help reduce wear on ignition system
Pure copper core results in cooler electrode temperature for maximized durability and fouling resistance
Some ACDelco Gold parts may have formerly appeared as ACDelco Professional
Premium aftermarket replacement part
Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models

Top-Rated Spark Plug Brands For Your 1966 Cadillac DeVille

When it comes to finding the perfect Spark Plug for your 1966 Cadillac DeVille, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 7 trusted brands. We carry the most popular Spark Plug brands including NGK, Champion, and Autolite, and more, all known for their exceptional customer ratings (average brand rating of 4.8 stars) and competitive prices, as low as $3.79. Purchasing a Spark Plug from us here at Advance Auto Parts is a smart move for both you and your 1966 Cadillac DeVille, providing peace of mind with parts that meet or exceed OEM standards.

Popular NGK 1966 Cadillac DeVille Spark Plugs

If you’re looking for a top-quality Spark Plug for your 1966 Cadillac DeVille, Advance Auto Parts has exactly what you need with our selection of NGK Spark Plugs. We have 2 NGK Spark Plugs in stock for this fitment, all known for their durability and precision fit. With prices starting at just $6.99 and an average cost of $11.99, you’ll find the perfect Spark Plug for your needs and budget. NGK Spark Plugs for the 1966 Cadillac DeVille come highly rated, with over 10 customer reviews and an impressive average rating of 4.8 stars. Choosing a NGK Spark Plug from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.

from $16.99

(1)

Iridium IX Spark Plug (XR5IX): Extreme Ignitability & Durability

“This is a high quality product”

from $6.99

(9)

V-Power Nickel Spark Plug (XR5): Enhanced Ignitability & Performance

“Yes they make the zap.zap when piston comes up to.compress fuel.and air”

Top-Quality Champion 1966 Cadillac DeVille Spark Plugs

For those in search of a high-quality Spark Plug for their 1966 Cadillac DeVille, Advance Auto Parts offers a great selection of Champion Spark Plugs. With 2 Champion Spark Plugs in stock, you can trust you’re getting top-tier parts designed for durability and a perfect fit. Prices for these Spark Plugs start at just $3.79, giving you a range of options to suit your budget. Backed by over 14 customer ratings and an average rating of 4.7 stars, Champion Spark Plugs provide both reliability and excellent performance. Choosing a Champion Spark Plug from Advance Auto Parts is a smart investment in your vehicle’s performance and longevity.

from $3.79

(13)

Copper Plus Small Engine Spark Plug (J8C): Dependable Performance & Durability

“Bought it for a Troy-Built Tomahawk chipper.”

from $3.79

(1)

Copper Plus Small Engine Spark Plug (J8C): Dependable Performance & Durability

“Only Advance carried this hard to find plug. It works as it should.”

FAQs for 1966 Cadillac DeVille Spark Plugs

What are the best-selling Spark Plugs for 1966 Cadillac DeVilles?

Out of 15 Spark Plugs that fit 1966 Cadillac DeVilles, the following parts are the top sellers:

Copper Core Spark Plug: Reliable Performance & Durability (5391369) – $6.29
DiamondFIRE Spark Plug: More Power & Fuel Efficiency (19650222) – $8.49
V-Power Nickel Spark Plug (XR5): Enhanced Ignitability & Performance (19650129) – $6.99

What’s the price range for 1966 Cadillac DeVille Spark Plugs?

The prices of Spark Plugs for the 1966 Cadillac DeVille range from $3.79 up to $99.99 for the most premium parts.

What is the average price of a Spark Plug for a 1966 Cadillac DeVille?

The average price for Spark Plugs for the 1966 Cadillac DeVille is $20.80. Keep in mind the variety of part types within our Spark Plug category, where you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Spark Plugs for other Cadillac DeVille model years?

Yes, we carry Spark Plugs for 51 model years of Cadillac DeVilles between 1953 and 2005. The following model years are the most popular for Spark Plug purchases: 2005, 2004, 2003, 2002, 2001, 2000, 1999, 1998, and 1997.

What are the cheapest Spark Plugs for my 1966 Cadillac DeVille?

The cheapest 1966 Cadillac DeVille Spark Plugs we carry are:

Copper Plus Small Engine Spark Plug (J8C): Dependable Performance & Durability (18470205) – $3.79
Copper Plus Small Engine Spark Plug (J8C): Dependable Performance & Durability (18470671) – $3.79
Copper Resistor Spark Plug: Quick Starts & Enhanced Durability (5390281) – $3.99
Copper Plus Spark Plug (RJ14YC): Dependable Performance & Durability (89011821) – $4.79
Platinum Spark Plug: Enhanced Durability & Improved Performance (12013882) – $4.99

Does Advance Auto Parts sell Spark Plugs for any other 1966 Cadillac models?

Yes. We stock Spark Plugs for 3 other popular 1966 Cadillac models. Some of the most popular are 1966 Eldorado Spark Plugs, 1966 Fleetwood Spark Plugs, 1966 Calais Spark Plugs, and 1966 Commercial Chassis Spark Plugs.

What are the top-rated Spark Plugs that fit the 1966 Cadillac DeVille?

Based on 82 reviews by customers, our 1966 Cadillac DeVille Spark Plugs have an average customer rating of 5 stars. These are the highest-rated categories of Spark Plugs for the 1966 Cadillac DeVille and their top-rated products:

Spark Plugs
- V-Power Nickel Spark Plug (XR5): Enhanced Ignitability & Performance (19650129) – $6.99
- Spark Plug Non-Foulers – 14mm Gasket Seat (5014956) – $7.99
- Copper Plus Small Engine Spark Plug (J8C): Dependable Performance & Durability (18470205) – $3.79
Spark Plug Wire Set Cut To Fits
- 8Mm Super Stock Graphite Uni (89012615) – $71.99
- 8Mm Super Stock Spiral Uni Bk (6900372) – $99.99

What types of Spark Plugs do you sell for my 1966 Cadillac DeVille?

As of 11/2/25, these are some of the most in-demand types of Spark Plugs for a 1966 Cadillac DeVille:

Can I get help with 1966 Cadillac DeVille Spark Plug orders?

Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about Cadillac Spark Plugs and more.

What is your return policy for Cadillac DeVille Spark Plugs?

Advance Auto Parts keeps returns simple. For new Cadillac DeVille Spark Plugs and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.

1966 Cadillac DeVille Spark Plugs

Accel – 8Mm Super Stock Graphite Uni (Part No.4040B)

Accel – 8Mm Super Stock Spiral Uni Bk (Part No.5040K)

Dorman – Help – Spark Plug Non-Foulers – 14mm Gasket Seat (Part No.42000)

NGK – V-Power Nickel Spark Plug (TR55): Enhanced Ignitability & Performance (Part No.3951)

Autolite – Copper Resistor Spark Plug: Quick Starts & Reliable Performance (Part No.104)

NGK – V-Power Nickel Spark Plug (UR45): Reliable Performance & Ignitability (Part No.6945)

ACDelco – Copper Core Spark Plug: Reliable Performance & Durability (Part No.R43S)

DENSO – Platinum TT Spark Plug – PW16TT (Part No.4501)

DENSO – Iridium Power Spark Plug: Maximum Spark Energy, 0.4mm Iridium Tip, IW16 (Part No.5305)

DENSO – Iridium TT Spark Plug: Ultimate Endurance and Power, 0.4mm Iridium Tip, IW16TT (Part No.4708)

ACDelco – Copper Core Spark Plug: Reliable Performance & OE Replacement (Part No.R42LTS)

DENSO – Iridium Power Spark Plug: Maximum Spark Energy, 0.4mm Iridium Tip, ITF16 (Part No.5330)

ACDelco – Professional Double Platinum Spark Plug: Enhanced Durability & Performance (Part No.41-963)

Champion – Double Platinum Power Spark Plug (RS12PYP): Enhanced Durability & Performance (Part No.7401)

Autolite – Copper Resistor Spark Plug: Quick Starts & Enhanced Durability (Part No.606)

ACDelco – Conventional Copper Core Spark Plug: Reduces Corrosion & Maximizes Durability (Part No.R45S)

NGK – V-Power Nickel Spark Plug (GR45): Enhanced Ignitability & Performance (Part No.4268)

Motorcraft – Standard Spark Plug (AGS32C): Reliable Performance & Durability (Part No.SP-436)

Champion – Iridium Spark Plug (RS8WYPB5): Maximum Performance & Longevity (Part No.9808)

Champion – Iridium Spark Plug (RS14WYPB5): Maximum Performance & Longevity (Part No.9404)

DENSO – Iridium Power Spark Plug: Maximum Spark Energy, 0.4mm Iridium Tip, IT16 (Part No.5325)

Autolite – Copper Resistor Spark Plug: Quick Starts & Enhanced Durability (Part No.85)

Champion – Copper Plus Spark Plug (RS12YC): Dependable Performance & Durability (Part No.401)

Dorman – Help – Spark Plug Non-Foulers – 14mm Tapered Seat (Part No.42008)

DENSO – U-Groove Spark Plug: OE Performance, T16EPR-U15 (Part No.5023)

E3 – DiamondFire Spark Plug (E3.46): Enhanced Power & Fuel Efficiency (Part No.E3.46)

Champion – Iridium Spark Plug (RS12WYPB4): Maximum Performance & Longevity (Part No.9204)

NGK – Standard Nickel Spark Plug (BPR4ES): Reliable OE Performance (Part No.6578)

Accel – 8Mm Super Stock Graphite Uni (Part No.4040B)

Accel – 8Mm Super Stock Spiral Uni Bk (Part No.5040K)

E3 – DiamondFIRE Spark Plug: More Power & Fuel Efficiency (Part No.E3.52)

NGK – V-Power Nickel Spark Plug (XR5): Enhanced Ignitability & Performance (Part No.3332)

Champion – Copper Plus Small Engine Spark Plug (J8C): Dependable Performance & Durability (Part No.841)

Autolite – Platinum Spark Plug: Enhanced Durability & Improved Performance (Part No.AP85)

Champion – Copper Plus Small Engine Spark Plug (J8C): Dependable Performance & Durability (Part No.841-1)

Dorman – Help – Spark Plug Non-Foulers – 14mm Gasket Seat (Part No.42000)

NGK – Iridium IX Spark Plug (XR5IX): Extreme Ignitability & Durability (Part No.7355)

ACDelco – Copper Core Spark Plug: Reliable Performance & Durability (Part No.R43S)

Autolite – Copper Resistor Spark Plug: Quick Starts & Enhanced Durability (Part No.85)

ACDelco – RAPIDFIRE Platinum Spark Plug: Reduces Misfires & Enhances Durability (Part No.7)

Accel – Shorty Copper Spark Plug (0437S): Enhanced Clearance & Heat Dissipation (Part No.8197)

Champion – Copper Plus Spark Plug (RJ14YC): Dependable Performance & Durability (Part No.63)

ACDelco – Double Platinum Spark Plug: Long-Lasting Performance & Durability (Part No.41-833)