1966 Plymouth Valiant Performance Engines

Keep Your 1966 Plymouth Valiant in Top Shape with Quality Performance Engines

Whether you’re repairing or upgrading your Performance Engine, using high-quality parts is key to keeping your 1966 Plymouth Valiant looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Performance Engine Intake Manifold Gaskets, Performance Engine Cylinder Head Gaskets, and Performance Engine Coolant Thermostats. 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 Performance Engines from Trusted Brands

Looking for a reliable Performance Engine? We’ve got you covered with options from brands you know and trust like Competition Cams. For example, Competition Cams Performance Engines start at just $33.99 with an average 4.1 star rating. With over 76 reviews and a solid 4 star average, you can shop with confidence knowing other Plymouth Valiant owners approve.

Competitive Prices and Extensive Inventory

The average price for a 1966 Plymouth Valiant Performance Engine at Advance Auto Parts is around $271.40, with a range that starts at $8.99 and goes up to $1,575.99. With 77 options in stock from 3 trusted brands, finding the right fit is easy. Popular picks like High Performance Thermostat, Ultra Seal: Valve Cover Gasket Set, and Intake Manifold Bolt Set – Chevrolet Small Block – Socket Head 3/8"-16 X 1" Bolts & Washers start at just $20.99 and offer a great balance of form and function.

Explore Related Parts

While you’re upgrading or replacing your Performance Engine, don’t forget to check out other key components like Performance Fuel Systems and Performance Oil Filters. At Advance Auto Parts, we’re here to help you keep your 1966 Plymouth Valiant in peak condition, inside and out.

Essential 1966 Plymouth Valiant Performance Engines

Competition Cams – VALVE SEALS, TEFLON 3/8" 1 ST (Part No.505-16)

VALVE SEALS, TEFLON 3/8" 1 ST

from

$33.99
COMP Cams offers a complete line of valve stem seals, from the umbrella seals to the positive-stop Teflon seal. These seals are a must to keep unwanted oil from entering the combustion chamber through the clearance in the valve guides. The umbrella seal is normally used when a larger-than-stock diameter spring is used, in the case of a double spring, the positive-stop Teflon seal is used. The umbrella seals require no machining, but with the Teflon seal it is necessary to disassemble the heads and machine the top of the guide with a special .530 diameter cutter. Whenever you are planning an engine overhaul or a cam change, don’t forget the valve seals.

Product Features:
  • Work with .530″ guides and 3/8″ valve stem diameter
  • Valve stem oil seals keep unwanted oil from entering the combustion chamber
  • Several different types of valve seals are offered
See More

Competition Cams – High Energy 212/212 Hydraulic Flat Cam (Part No.20-210-2)

High Energy 212/212 Hydraulic Flat Cam

from

$394.99
Ideal for use with mainly stock components like rocker arms, intake manifolds, cylinder heads, compression ratio, torque converters and rear gear ratios, the High Energy camshaft grind family is a great choice for street performance applications.

Product Features:
  • Good blend of efficiency and performance.
  • Perfect choice for performance street rebuilds.
  • Work well with mainly stock components such as rockers, manifolds, heads, compression, torque converters and gears.
See More

Competition Cams – High Energy 206/206 Hydraulic Flat Cam (Part No.20-208-2)

High Energy 206/206 Hydraulic Flat Cam

from

$436.99
Ideal for use with mainly stock components like rocker arms, intake manifolds, cylinder heads, compression ratio, torque converters and rear gear ratios, the High Energy camshaft grind family is a great choice for street performance applications.

Product Features:
  • Good blend of efficiency and performance.
  • Perfect choice for performance street rebuilds.
  • Work well with mainly stock components such as rockers, manifolds, heads, compression, torque converters and gears.
See More

Competition Cams – Xtreme Energy 212/218 Hydraulic Flat Cam (Part No.20-221-3)

Xtreme Energy 212/218 Hydraulic Flat Cam

from

$284.99
Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts,

Product Features:
  • Excellent performance in street carbureted applications.
  • More vacuum allows an increase in duration for improved performance and assists power brakes.
  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve.
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios etc.
See More

Mr. Gasket – High Performance Thermostat – 160 Degree Brass & Copper (Part No.4363)

High Performance Thermostat - 160 Degree Brass & Copper

from

$29.49
Mr. Gasket High Performance Thermostats are designed to resist large variations of coolant pressure at high RPM (revolutions per minute). This allows them to fully open at correct temperature consistently regardless of engine RPM. The design also provides the high flow that engines operated a higher RPM need. This thermostat also features a copper/brass construction to further resist corrosion. Mr. Gasket High Performance / High Flow Thermostats are suitable for street, drag race, or oval track applications.

Product Features:
  • Opens at 160 Degrees
  • Designed to Resist Large Variations of Coolant Pressure at High RPM
  • Fully opens at Correct Temperature Consistently Regardless of engine RPM
  • For High Performance Street, Drag Race, and Oval Track
  • Copper & Brass Construction – Resists Corrosion
  • High Flow
See More

Mr. Gasket – High Performance Thermostat (Part No.4365)

High Performance Thermostat

from

$31.99
Mr. Gasket High Performance Thermostats are designed to resist large variations of coolant pressure at high RPM (revolutions per minute). This allows them to fully open at correct temperature consistently regardless of engine RPM. The design also provides the high flow that engines operated a higher RPM need. This thermostat also features a copper/brass construction to further resist corrosion. Mr. Gasket High Performance / High Flow Thermostats are suitable for street, drag race, or oval track applications.

Product Features:
  • Opens At 195 Degrees
  • Designed to Resist Large Variations of Coolant Pressure at High RPM
  • Fully Opens at Correct Temperature Consistently Regardless of Engine RPM
  • For High Performance Street, Drag Race, and Oval Track
  • Copper & Brass Construction – Resists Corrosion
  • High Flow
See More

Mr. Gasket – High Performance 180 Degree Thermostat for Increased Flow (Part No.4364)

High Performance 180 Degree Thermostat for Increased Flow

from

$29.99
Mr. Gasket High Performance Thermostats are designed to resist large variations of coolant pressure at high RPM (revolutions per minute). This allows them to fully open at correct temperature consistently regardless of engine RPM. The design also provides the high flow that engines operated a higher RPM need. This thermostat also features a copper/brass construction to further resist corrosion. Mr. Gasket High Performance / High Flow Thermostats are suitable for street, drag race, or oval track applications.

Product Features:
  • Opens At 180 Degrees
  • Designed to Resist Large Variations of Coolant Pressure at High RPM
  • Fully Opens at Correct Temperature Consistently Regardless of Engine RPM
  • For High Performance Street, Drag Race, and Oval Track
  • Copper & Brass Construction – Resists Corrosion
  • High Flow
See More

FEL-PRO Performance – Performance Oil Pan Gasket Set (Part No.1807)

Performance Oil Pan Gasket Set

from

$31.99
Fel-Pro Performance Gaskets deliver reliable sealing under grueling racing conditions.

Product Features:
  • Felcoid/Plus gaskets have a fiber sheet core and a latex rubber coating to eliminate potential leakage paths. The core material resists crushing and splitting, while providing excellent blowout resistance.
  • With steel core to provide ultimate excellent blowout resistance.
  • Not intended for use in emission controlled vehicles.
See More

FEL-PRO Performance – Engine Oil Pan Gasket Set (Part No.1805)

Engine Oil Pan Gasket Set

from

$21.99
Fel-Pro Performance Gaskets deliver reliable sealing under grueling racing conditions

Product Features:
  • Felcoid/Plus gaskets have a fiber sheet core and a latex rubber coating to eliminate potential leakage paths. The core material resists crushing and splitting, while providing excellent blowout resistance.
  • With steel core to provide ultimate excellent blowout resistance.
  • Not intended for use in emission controlled vehicles.
See More

FEL-PRO Performance – PERFORMANCE OIL PAN GASKET SET (Part No.1806)

PERFORMANCE OIL PAN GASKET SET

from

$21.99
Fel-Pro Performance Gaskets deliver reliable sealing under grueling racing conditions

Product Features:
  • Felcoid/Plus gaskets have a fiber sheet core and a latex rubber coating to eliminate potential leakage paths. The core material resists crushing and splitting, while providing excellent blowout resistance.
  • With steel core to provide ultimate excellent blowout resistance.
  • Not intended for use in emission controlled vehicles.
See More

Edelbrock – Cylinder Head Gasket Set for Chrysler (Part No.7326)

Cylinder Head Gasket Set for Chrysler

from

$65.99
Product Features:
  • Cylinder Head Gasket
  • 1966-1987 318-340-360
See More

FEL-PRO Performance – Performance Cylinder Head Gasket (Part No.1008)

Performance Cylinder Head Gasket

from

$44.99
Fel-Pro Performance Gaskets deliver reliable sealing under grueling racing conditions.

Product Features:
  • Fel-Pro Performance head gaskets accommodate the high cylinder pressures and cylinder head movement associated with performance engines.
  • Inserted within a stainless steel armor surrounding each cylinder, wire ring design provides highly concentrated sealing around the combustion chamber.
  • Raises combustion sealing force to roughly three times that of standard head gaskets.
  • Steel wire rings for the greatest combustion seal strength.
  • Not intended for use in emission controlled vehicles.
See More

Mr. Gasket – Intake Manifold Bolt Set – Chevrolet Small Block – Socket Head 3/8"-16 X 1" Bolts & Washers (Part No.956G)

Intake Manifold Bolt Set - Chevrolet Small Block - Socket Head 3/8"-16 X 1" Bolts & Washers

from

$20.99
These grade 5 hex head bolts are brite zinc plated for protection and appearance. Hardened flat washers provide uniform torque & prevent galling on aluminum manifolds. Includes twelve (12) 3/8 inch-16 x 1 inch bolts & washers

Product Features:
  • Zinc plated to resist corrosion and provide a clean professional appearance
  • Made from Grade 5 steel for strength and durability
  • Flat washers provide uniform clamp load and prevent galling on aluminum intake manifolds
  • Allen (socket) Head
  • Zinc Plated For Protection
See More

FEL-PRO Performance – Lower Intake Manifold Gasket Set: 6 Piece Set (Part No.1243)

Lower Intake Manifold Gasket Set: 6 Piece Set

from

$43.99
Fel-Pro Performance Gaskets deliver reliable sealing under grueling racing conditions

Product Features:
  • DESIGNED FOR IMPERFECT SEALING SURFACES — Engineered and manufactured specifically for the repair environment to help seal imperfect sealing surfaces
  • SEALING TECHNOLOGIES — Exclusive sealing innovations and technologies with proprietary materials and unique design features to ensure a superior seal for your repair
  • ENGINEERING EXPERTISE — Parts are designed, reviewed, validated and approved by Fel-Pro engineers through rigorous research and development
  • REAL-WORLD TESTED — Parts are tested on-vehicle and validated to ensure optimal performance on the road
  • EVERY PART FOR THE REPAIR — Fel-Pro gasket sets include every part needed for the repair unless otherwise noted
See More

Mr. Gasket – Ultra Seal: Intake Gasket (Part No.5840)

Ultra Seal: Intake Gasket

from

$49.99
Ultra-Seal intake manifold gaskets are manufactured from cellulose/nitrile composition gasket material. Provides excellent sealing and durability. Incorporates Silicone beading around each intake and water outlet port to provide additional sealing strength on both sides of each gasket. No gasket sealer required. For OE replacement, high performance street, drag race and oval track use. Includes manifold end seals and distributor gasket.

Product Features:
  • Manufactured from cellulose/nitrile composition gasket material
  • Provides excellent sealing and durability
  • Silicone beading on both sides of each gasket
  • Complete with manifold end seals and distributor gasket
  • For OE replacement, high performance street, drag race and oval track use
  • Creates Tight Leak proof Seal
See More

Mr. Gasket – Intake Gasket (Part No.307G)

Intake Gasket

from

$48.99
Mr. Gasket Performance Intake Gaskets are manufactured from cellulose/nitrile composition gasket material. They provide excellent sealing and durability. Can be trimmed if necessary for modified port applications. Complete with manifold end seals and distributor gasket (where applicable). For original equipment replacement, high performance street, drag race and oval track.

Product Features:
  • Manufactured from cellulose/nitrile composition gasket material
  • Provides excellent sealing and durability
  • Can be trimmed if necessary for modified port applications
  • Complete with manifold end seals and distributor gasket where applicable
  • For OE replacement, high performance street, drag race and oval track use
See More

FEL-PRO Performance – Lower Intake Manifold Gasket Set: 6 Piece Set (Part No.1213)

Lower Intake Manifold Gasket Set: 6 Piece Set

from

$36.99
Fel-Pro Performance Gaskets deliver reliable sealing under grueling racing conditions

Product Features:
  • DESIGNED FOR IMPERFECT SEALING SURFACES — Engineered and manufactured specifically for the repair environment to help seal imperfect sealing surfaces
  • SEALING TECHNOLOGIES — Exclusive sealing innovations and technologies with proprietary materials and unique design features to ensure a superior seal for your repair
  • ENGINEERING EXPERTISE — Parts are designed, reviewed, validated and approved by Fel-Pro engineers through rigorous research and development
  • REAL-WORLD TESTED — Parts are tested on-vehicle and validated to ensure optimal performance on the road
  • EVERY PART FOR THE REPAIR — Fel-Pro gasket sets include every part needed for the repair unless otherwise noted
See More

FEL-PRO Performance – Engine Valve Cover Gasket Set (Part No.1608)

Engine Valve Cover Gasket Set

from

$37.49
Product Features:
  • DESIGNED FOR IMPERFECT SEALING SURFACES – Engineered and manufactured specifically for the repair environment to help seal imperfect sealing surfaces
  • ENGINEERED TO PERFORM – Proprietary cork-rubber formulation
  • SUPERIOR SEAL – Highly conformable to accommodate for the imperfect sealing surfaces
  • EVERY PART FOR THE REPAIR – Fel-Pro gasket sets include every part needed for the repair unless otherwise noted
  • REAL-WORLD TESTED – Parts are tested on-vehicle and validated to ensure optimal performance on the road
See More

Mr. Gasket – Valve Cover Gasket Set (Part No.379)

Valve Cover Gasket Set

from

$41.99
Mr. Gasket Performance Valve Cover Gaskets are high-density cork/rubber blend gaskets that use evenly sized cork particles distributed evenly throughout the rubber binder. The result is a compressible valve cover gasket without leak paths. These gaskets create a positive seal by controlled swelling of the gasket material when exposed to hot engine oil. Provides excellent flange sealing and durability. For original equipment replacement, high performance street, drag race and oval track use.

Product Features:
  • Manufactured from high-density cork/rubber blend gasket material
  • Provides excellent sealing and durability
  • For OE replacement, high performance street, drag race and oval track use
See More

FEL-PRO Performance – Performance Valve Cover Gasket Set (Part No.1607)

Performance Valve Cover Gasket Set

from

$18.99
Fel-Pro® Performance Gaskets deliver reliable sealing under grueling racing conditions.

Product Features:
  • Blue Stripe® performance cork-rubber gaskets use cork particles evenly distributed throughout a rubber binder resulting in a compressible gasket without leak paths.
  • Not intended for use in emission controlled vehicles.
See More

Mr. Gasket – Ultra Seal: Valve Cover Gasket Set (Part No.5876)

Ultra Seal: Valve Cover Gasket Set

from

$44.99
Ultra-Seal is Mr. Gasket premium valve cover gasket material. It’s manufactured from a high density cork and rubber blend with a black latex coat applied to the outside to help seal minor flange irregularites and eliminate oil leakage. It creates a positive seal by controlled swelling of the gasket material when exposed to hot oil. For original equipment replacement, high performance street, drag race and oval track use. Sold as a pair, these gaskets are .187 inch thick.

Product Features:
  • Manufactured from high-density cork /rubber blend gasket material
  • A black latex rubber coating is applied to outside of gasket to help seal minor flange irregularities and eliminate the possibility of oil leakage
  • Creates a positive seal by controlled swelling of the gasket material when exposed to hot engine oil
  • For OE replacement, high performance street, drag race and oval track
  • .187″ thick
  • Handles Ex Flange Pressure
  • Forms Leak Proof Seal
  • Black Latex Coating
See More

Competition Cams – High Energy 218/218 Hydraulic Flat Cam K-Kit (Part No.K20-212-2)

High Energy 218/218 Hydraulic Flat Cam K-Kit

from

$1398.99
Ideal for use with mainly stock components like rocker arms, intake manifolds, cylinder heads, compression ratio, torque converters and rear gear ratios, the High Energy camshaft grind family is a great choice for street performance applications.

Product Features:
  • Good blend of efficiency and performance.
  • Perfect choice for performance street rebuilds.
  • Work well with mainly stock components such as rockers, manifolds, heads, compression, torque converters and gears.
See More

Competition Cams – Xtreme Energy 224/230 Hydraulic Flat Cam and Lifter Kit (Part No.CL20-223-3)

Xtreme Energy 224/230 Hydraulic Flat Cam and Lifter Kit

from

$344.99
SMALL BLOCK CHRYSLER HYDRAULIC CAM AND LIFTER KIT – Xtreme Energy: Great for street machines, largest cam for stock converter, 273-318 works best with 2000 stall.

Product Features:
  • Cam and lifter kit for Small Block Chrysler engines
  • CL-Kit includes cam, lifters, assembly lube, instructions and decals
  • HYDRAULIC – Xtreme Energy: Great for street machines, largest cam for stock converter, 273-318 works best with 2000 stall.
  • 268/280 Advertised Duration, 224/230 Duration @ .050″, .477″/.480″ Lift, 110 Lobe Separation
  • Valve spring upgrade required
See More

Competition Cams – High Energy 206/206 Hydraulic Flat Cam and Lifter Kit (Part No.CL20-208-2)

High Energy 206/206 Hydraulic Flat Cam and Lifter Kit

from

$970.99
Ideal for use with mainly stock components like rocker arms, intake manifolds, cylinder heads, compression ratio, torque converters and rear gear ratios, the High Energy camshaft grind family is a great choice for street performance applications.

Product Features:
  • Good blend of efficiency and performance.
  • Perfect choice for performance street rebuilds.
  • Work well with mainly stock components such as rockers, manifolds, heads, compression, torque converters and gears.
See More

Competition Cams – Xtreme Energy 212/218 Hydraulic Flat Cam and Lifter Kit (Part No.CL20-221-3)

Xtreme Energy 212/218 Hydraulic Flat Cam and Lifter Kit

from

$344.99
Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts.

Product Features:
  • Excellent performance in street carbureted applications.
  • More vacuum allows an increase in duration for improved performance and assists power brakes.
  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve.
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios etc.
See More

Competition Cams – High Energy 206/206 Hydraulic Flat Cam K-Kit (Part No.K20-208-2)

High Energy 206/206 Hydraulic Flat Cam K-Kit

from

$1398.99
Ideal for use with mainly stock components like rocker arms, intake manifolds, cylinder heads, compression ratio, torque converters and rear gear ratios, the High Energy camshaft grind family is a great choice for street performance applications.

Product Features:
  • Good blend of efficiency and performance.
  • Perfect choice for performance street rebuilds.
  • Work well with mainly stock components such as rockers, manifolds, heads, compression, torque converters and gears.
See More

Competition Cams – Xtreme Energy 218/224 Hydraulic Flat Cam K-Kit (Part No.K20-222-3)

Xtreme Energy 218/224 Hydraulic Flat Cam K-Kit

from

$578.99
Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts.

Product Features:
  • Excellent performance in street carbureted applications.
  • More vacuum allows an increase in duration for improved performance and assists power brakes.
  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve.
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios etc.
See More

Most Popular Performance Engine Intake Manifold Gasket for 1966 Plymouth Valiants

Enhance your 1966 Plymouth Valiant with this popular Performance Engine Intake Manifold Gasket we have in stock, for $43.99.

FEL-PRO Performance – Lower Intake Manifold Gasket Set: 6 Piece Set (Part No.1243)

Lower Intake Manifold Gasket Set: 6 Piece Set

from

$43.99
Fel-Pro Performance Gaskets deliver reliable sealing under grueling racing conditions

Product Features:
  • DESIGNED FOR IMPERFECT SEALING SURFACES — Engineered and manufactured specifically for the repair environment to help seal imperfect sealing surfaces
  • SEALING TECHNOLOGIES — Exclusive sealing innovations and technologies with proprietary materials and unique design features to ensure a superior seal for your repair
  • ENGINEERING EXPERTISE — Parts are designed, reviewed, validated and approved by Fel-Pro engineers through rigorous research and development
  • REAL-WORLD TESTED — Parts are tested on-vehicle and validated to ensure optimal performance on the road
  • EVERY PART FOR THE REPAIR — Fel-Pro gasket sets include every part needed for the repair unless otherwise noted
See More

Best-Selling 1966 Plymouth Valiant Performance Engine Cylinder Head Gasket

Upgrade your Valiant with our best-selling Performance Engine Cylinder Head Gasket.

FEL-PRO Performance – Performance Cylinder Head Gasket (Part No.1008)

Performance Cylinder Head Gasket

from

$44.99
Fel-Pro Performance Gaskets deliver reliable sealing under grueling racing conditions.

Product Features:
  • Fel-Pro Performance head gaskets accommodate the high cylinder pressures and cylinder head movement associated with performance engines.
  • Inserted within a stainless steel armor surrounding each cylinder, wire ring design provides highly concentrated sealing around the combustion chamber.
  • Raises combustion sealing force to roughly three times that of standard head gaskets.
  • Steel wire rings for the greatest combustion seal strength.
  • Not intended for use in emission controlled vehicles.
See More

Top-Quality Performance Engine Coolant Thermostats for 1966 Plymouth Valiants

Choose a high-quality OEM or aftermarket Performance Engine Coolant Thermostat for Plymouth Valiants and enjoy top-notch performance from $29.49.

Mr. Gasket – High Performance 180 Degree Thermostat for Increased Flow (Part No.4364)

High Performance 180 Degree Thermostat for Increased Flow

from

$29.99
Mr. Gasket High Performance Thermostats are designed to resist large variations of coolant pressure at high RPM (revolutions per minute). This allows them to fully open at correct temperature consistently regardless of engine RPM. The design also provides the high flow that engines operated a higher RPM need. This thermostat also features a copper/brass construction to further resist corrosion. Mr. Gasket High Performance / High Flow Thermostats are suitable for street, drag race, or oval track applications.

Product Features:
  • Opens At 180 Degrees
  • Designed to Resist Large Variations of Coolant Pressure at High RPM
  • Fully Opens at Correct Temperature Consistently Regardless of Engine RPM
  • For High Performance Street, Drag Race, and Oval Track
  • Copper & Brass Construction – Resists Corrosion
  • High Flow
See More

Mr. Gasket – High Performance Thermostat – 160 Degree Brass & Copper (Part No.4363)

High Performance Thermostat - 160 Degree Brass & Copper

from

$29.49
Mr. Gasket High Performance Thermostats are designed to resist large variations of coolant pressure at high RPM (revolutions per minute). This allows them to fully open at correct temperature consistently regardless of engine RPM. The design also provides the high flow that engines operated a higher RPM need. This thermostat also features a copper/brass construction to further resist corrosion. Mr. Gasket High Performance / High Flow Thermostats are suitable for street, drag race, or oval track applications.

Product Features:
  • Opens at 160 Degrees
  • Designed to Resist Large Variations of Coolant Pressure at High RPM
  • Fully opens at Correct Temperature Consistently Regardless of engine RPM
  • For High Performance Street, Drag Race, and Oval Track
  • Copper & Brass Construction – Resists Corrosion
  • High Flow
See More

Mr. Gasket – High Performance Thermostat (Part No.4365)

High Performance Thermostat

from

$31.99
Mr. Gasket High Performance Thermostats are designed to resist large variations of coolant pressure at high RPM (revolutions per minute). This allows them to fully open at correct temperature consistently regardless of engine RPM. The design also provides the high flow that engines operated a higher RPM need. This thermostat also features a copper/brass construction to further resist corrosion. Mr. Gasket High Performance / High Flow Thermostats are suitable for street, drag race, or oval track applications.

Product Features:
  • Opens At 195 Degrees
  • Designed to Resist Large Variations of Coolant Pressure at High RPM
  • Fully Opens at Correct Temperature Consistently Regardless of Engine RPM
  • For High Performance Street, Drag Race, and Oval Track
  • Copper & Brass Construction – Resists Corrosion
  • High Flow
See More

Top Picks for 1966 Plymouth Valiant Performance Engine Valve Cover Gasket Sets

Invest in one of our 4 durable Performance Engine Valve Cover Gasket Sets for your 1966 Plymouth, knowing you’re getting trusted brands and expert craftsmanship.

Mr. Gasket – Valve Cover Gasket Set (Part No.379)

Valve Cover Gasket Set

from

$41.99
Mr. Gasket Performance Valve Cover Gaskets are high-density cork/rubber blend gaskets that use evenly sized cork particles distributed evenly throughout the rubber binder. The result is a compressible valve cover gasket without leak paths. These gaskets create a positive seal by controlled swelling of the gasket material when exposed to hot engine oil. Provides excellent flange sealing and durability. For original equipment replacement, high performance street, drag race and oval track use.

Product Features:
  • Manufactured from high-density cork/rubber blend gasket material
  • Provides excellent sealing and durability
  • For OE replacement, high performance street, drag race and oval track use
See More

FEL-PRO Performance – Performance Valve Cover Gasket Set (Part No.1607)

Performance Valve Cover Gasket Set

from

$18.99
Fel-Pro® Performance Gaskets deliver reliable sealing under grueling racing conditions.

Product Features:
  • Blue Stripe® performance cork-rubber gaskets use cork particles evenly distributed throughout a rubber binder resulting in a compressible gasket without leak paths.
  • Not intended for use in emission controlled vehicles.
See More

Mr. Gasket – Ultra Seal: Valve Cover Gasket Set (Part No.5876)

Ultra Seal: Valve Cover Gasket Set

from

$44.99
Ultra-Seal is Mr. Gasket premium valve cover gasket material. It’s manufactured from a high density cork and rubber blend with a black latex coat applied to the outside to help seal minor flange irregularites and eliminate oil leakage. It creates a positive seal by controlled swelling of the gasket material when exposed to hot oil. For original equipment replacement, high performance street, drag race and oval track use. Sold as a pair, these gaskets are .187 inch thick.

Product Features:
  • Manufactured from high-density cork /rubber blend gasket material
  • A black latex rubber coating is applied to outside of gasket to help seal minor flange irregularities and eliminate the possibility of oil leakage
  • Creates a positive seal by controlled swelling of the gasket material when exposed to hot engine oil
  • For OE replacement, high performance street, drag race and oval track
  • .187″ thick
  • Handles Ex Flange Pressure
  • Forms Leak Proof Seal
  • Black Latex Coating
See More

FEL-PRO Performance – Engine Valve Cover Gasket Set (Part No.1608)

Engine Valve Cover Gasket Set

from

$37.49
Product Features:
  • DESIGNED FOR IMPERFECT SEALING SURFACES – Engineered and manufactured specifically for the repair environment to help seal imperfect sealing surfaces
  • ENGINEERED TO PERFORM – Proprietary cork-rubber formulation
  • SUPERIOR SEAL – Highly conformable to accommodate for the imperfect sealing surfaces
  • EVERY PART FOR THE REPAIR – Fel-Pro gasket sets include every part needed for the repair unless otherwise noted
  • REAL-WORLD TESTED – Parts are tested on-vehicle and validated to ensure optimal performance on the road
See More

Our Performance Engine Oil Pan Gaskets for 1966 Plymouth Valiants

Make a smart move for your 1966 Plymouth Valiant with our Performance Engine Oil Pan Gasket for $21.99.

FEL-PRO Performance – Engine Oil Pan Gasket Set (Part No.1805)

Engine Oil Pan Gasket Set

from

$21.99
Fel-Pro Performance Gaskets deliver reliable sealing under grueling racing conditions

Product Features:
  • Felcoid/Plus gaskets have a fiber sheet core and a latex rubber coating to eliminate potential leakage paths. The core material resists crushing and splitting, while providing excellent blowout resistance.
  • With steel core to provide ultimate excellent blowout resistance.
  • Not intended for use in emission controlled vehicles.
See More

Top-Rated Performance Engine Brands For Your 1966 Plymouth Valiant

When it comes to finding the perfect Performance Engine for your 1966 Plymouth Valiant, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 3 trusted brands. We carry the most popular Performance Engine brands including Competition Cams, and more, all known for their exceptional customer ratings (average brand rating of 4.1 stars) and competitive prices, as low as $33.99. Purchasing a Performance Engine from us here at Advance Auto Parts is a smart move for both you and your 1966 Plymouth Valiant, providing peace of mind with parts that meet or exceed OEM standards.

Popular Competition Cams 1966 Plymouth Valiant Performance Engines

If you’re looking for a top-quality Performance Engine for your 1966 Plymouth Valiant, Advance Auto Parts has exactly what you need with our selection of Competition Cams Performance Engines. We have 1 Competition Cams Performance Engines in stock for this fitment, all known for their durability and precision fit. With prices starting at just $33.99, you’ll find the perfect Performance Engine for your needs and budget. Competition Cams Performance Engines for the 1966 Plymouth Valiant come highly rated, with over 1 customer reviews and an impressive average rating of 4.1 stars. Choosing a Competition Cams Performance Engine from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.
VALVE SEALS, TEFLON 3/8" 1 ST
from $33.99
(1)
VALVE SEALS, TEFLON 3/8" 1 ST
“As good as OEM.”

FAQs for 1966 Plymouth Valiant Performance Engines

What are the best-selling Performance Engines for 1966 Plymouth Valiants?

Out of 77 Performance Engines that fit 1966 Plymouth Valiants, the following parts are the top sellers:

What’s the price range for 1966 Plymouth Valiant Performance Engines?

The prices of Performance Engines for the 1966 Plymouth Valiant range from $8.99 up to $1,575.99 for the most premium parts.

What is the average price of a Performance Engine for a 1966 Plymouth Valiant?

The average price for Performance Engines for the 1966 Plymouth Valiant is $271.40. Keep in mind the variety of part types within our Performance Engine category, where you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Performance Engines for other Plymouth Valiant model years?

Yes, we carry Performance Engines for 15 model years of Plymouth Valiants between 1960 and 1976. The following model years are the most popular for Performance Engine purchases: 1976, 1975, 1974, 1973, 1972, 1971, 1970, 1969, and 1968.

What are the cheapest Performance Engines for my 1966 Plymouth Valiant?

Does Advance Auto Parts sell Performance Engines for any other 1966 Plymouth models?

Yes. We stock Performance Engines for 5 other popular 1966 Plymouth models. Some of the most popular are 1966 Barracuda Performance Engines, 1966 Belvedere Performance Engines, 1966 Belvedere II Performance Engines, 1966 Fury Performance Engines, and 1966 Fury III Performance Engines.

What are the top-rated Performance Engines that fit the 1966 Plymouth Valiant?

The one 1966 Plymouth Valiant Performance Engine we have in stock is the Hardened Lash Cap with 3/8" Valve Stem, .190" Head Height. It costs $8.99.

What types of Performance Engines do you sell for my 1966 Plymouth Valiant?

As of 11/2/25, these are some of the most in-demand types of Performance Engines for a 1966 Plymouth Valiant:

Can I get help with 1966 Plymouth Valiant Performance Engine orders?

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

What is your return policy for Plymouth Valiant Performance Engines?

Advance Auto Parts keeps returns simple. For new Plymouth Valiant Performance Engines and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.