1970 Checker Marathon Engine Timing Parts
Keep Your 1970 Checker Marathon in Top Shape with Quality Engine Timing Parts
Whether you’re repairing or upgrading your Engine Timing Part, using high-quality parts is key to keeping your 1970 Checker Marathon looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Timing Cover Seals, Timing Cam Gears, and Timing Covers. 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 Engine Timing Parts from Trusted Brands
Looking for a reliable Engine Timing Part? We’ve got you covered with options from brands you know and trust like National and Competition Cams. For example, National Engine Timing Parts start at just $18.79 with an average 4.3 star rating. Competition Cams offer similar pricing and quality, backed by strong customer feedback. With over 44 reviews and a solid 5 star average, you can shop with confidence knowing other Checker Marathon owners approve.
Competitive Prices and Extensive Inventory
The average price for a 1970 Checker Marathon Engine Timing Part at Advance Auto Parts is around $104.73, with a range that starts at $8.49 and goes up to $589.99. With 22 options in stock from 7 trusted brands, finding the right fit is easy. Popular picks like Engine Timing Chain, Engine Harmonic Balancer Kit, and Engine Timing Set start at just $22.99 and offer a great balance of form and function.
Explore Related Parts
While you’re upgrading or replacing your Engine Timing Part, don’t forget to check out other key components like Camshafts and Engine Gaskets and Seals. At Advance Auto Parts, we’re here to help you keep your 1970 Checker Marathon in peak condition, inside and out.
Find Your Specific 1970 Checker Marathon Engine Timing Parts
Looking for the perfect Engine Timing Part for your 1970 Checker Marathon? You’re in the right place. Below, you’ll find links to various types of Engine Timing Parts that fit your vehicle. At Advance Auto Parts, we offer only the highest quality OEM and aftermarket Engine Timing Parts, ensuring durability and a precise fit for your Checker Marathon. Whether you’re driving a 1970 model or another popular model year like
1974,
1975,
1976,
1977,
1978,
1979,
1980,
1981, and
1982, we’ve got you covered. Purchasing Engine Timing Parts 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 Engine Timing Parts that fit your vehicle.
Essential 1970 Checker Marathon Engine Timing Parts
INA US – ENG TIMING GEAR SET (Part No.ZC-2528S)
from
$111.99
ENG TIMING GEAR SET
Competition Cams – 3-Piece Timing Gear Set With Fully Adjustable Camshaft And Crank Sprockets (Part No.160001)
from
$82.99
Features 3 ways of optional timing adjustment. The Zoom Timing Gear Set features nodular iron sprockets and a dual-row roller chain for accuracy and durability.
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Cloyes Gear – Engine Timing Set (Part No.C-3001K)
from
$27.99
Utilizes the latest in design and technology to offer complete chain sets. CAD designed and manufactured using premium materials. Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance. Utilizes the latest in design and technology to offer complete chain sets. Refer to our online catalog for detailed application-specific information. SET INCLUDES: S390T Engine Timing Camshaft Sprocket (1 EA), S391 Engine Timing Crankshaft Sprocket (1 EA), C499 Engine Timing Chain (1 EA).
Product Features:
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Product Features:
- Timing Set includes all components for a quick and efficient replacement
- CAD designed and manufactured using premium materials
- Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
- Utilizes the latest in design and technology to offer complete chain sets
- Refer to our online catalog for detailed application-specific information
National – Engine Harmonic Balancer Kit (Part No.5000)
from
$28.99
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
Product Features:
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Product Features:
- Includes timing cover seal and harmonic balancer sleeve
- Solves the oil leaking around timing cover seal
- Made of stainless steel
- Takes up gaps caused by worn-out harmonic balancer shafts
MAHLE Original – Engine Timing Cover Seal (Part No.65022)
from
$15.99
MAHLE® gaskets provide world class sealing products trusted by OEMs & Technicians around the globe.
Product Features:
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Product Features:
- All MAHLE gaskets meet or exceed the original equipment specifications providing the finest sealing products available
- MAHLE gaskets utilizes OE equivalent or better materials in all our gaskets
- MAHLE gaskets is the leader in Domestic, Asian and European applications
- The contents of MAHLE gaskets are packaged in shrink wrapped tray, giving you the added security of knowing that you have the right parts, prior to opening the package
National – Shaft Repair Sleeve (Part No.99218)
from
$60.99
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
Product Features:
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Product Features:
- Designed to repair damaged, grooved or worn shafts
- Durable stainless steel construction for corrosion-free sealing surface that surpasses most original shaft specifications
- Ideal for a shaft where indications of seal wear, such as tracks or grooves have developed
- Ultra-thin construction (0.01/0.25mm wall thickness) allows original seal size to be used with minimal additional lip loading
- Easy to install with removable flange and installation tool
National – Engine Harmonic Balancer Repair Sleeve (Part No.88176)
from
$18.79
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
Product Features:
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Product Features:
- Made of stainless steel
- Designed to prevent timing cover seal leaks
- Takes up gaps caused by worn-out harmonic balancer shafts
INA US – ENGINE TIMING CHAIN (Part No.ZC-C499)
from
$32.99
ENGINE TIMING CHAIN
Cloyes Gear – Engine Timing Chain (Part No.C499)
from
$22.99
Since 1921, Cloyes has been the trusted leader in automotive timing systems. Our timing chains are built to synchronize crankshaft and camshaft rotation with absolute accuracy, ensuring precise valve timing and long-term engine performance. Available as stand-alone chains or in complete kits, Cloyes timing chains are manufactured from premium materials, heat-treated, pre-stressed and engineered for a perfect chain-to-sprocket tooth fit – delivering quiet operation, durability, and OE-level performance you can count on. To ensure total timing system integrity, Cloyes recommends replacing the chain along with the tensioners, guides, and sprockets during service. Trusted by professionals for over a century & backed by an industry-leading limited Warranty and technical support.
Product Features:
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Product Features:
- Pre-stressed and heat-treated steel construction for increased strength, and wear resistance, delivering long-term durability even in high-stress environments
- Cloyes chains are engineered and manufactured with precision pitch control to ensure optimal chain-to-sprocket fit reducing noise, minimizing fatigue, and maintaining accurate timing
- Designed in the USA and manufactured using premium materials for OE-level fit and function, allowing for smooth installation and reliable performance
- Each part is extensively tested for function, fitment, and durability to ensure consistent quality and optimal performance, reducing the risk of comebacks
- Available in application-specific kit or as a stand-alone chain, offering installation flexibility and convenience
- Backed by Limited Lifetime Warranty and over 100 years in engineering leadership with unmatched technical support and repair confidence in every component
Cloyes Gear – Engine Timing Camshaft Sprocket (Part No.S390T)
from
$11.99
Sprocket Made From High Alloy Material. Features Precision Tooth Form To Assure Proper Chain Engagement, And Is Balanced For Proper Timing.
Product Features:
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Product Features:
- Featuring precision-tooled or machined tooth form and precision-machined bore for true fit, timing chain sprockets offer reliability and dependability for engine rebuilds and typical replacement jobs
- Recommended that the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced, as these components play a vital role in system stability and accurate timing
- CAD designed and manufactured using premium materials
- Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
- Refer to our online catalog for detailed application-specific information
Cloyes Gear – Engine Timing Camshaft Gear (Part No.2524)
from
$37.99
Lightweight Aluminum Construction. Features Helical Tooth Form For Quiet Operation, And Precision Machined Bore For True Fit.
Product Features:
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Product Features:
- Featuring precision-tooled or machined tooth form and precision-machined bore for true fit, timing chain gears offer reliability and dependability for engine rebuilds and typical replacement jobs
- Helical tooth form for quiet operation and precision machined bore for true fit
- CAD designed and manufactured using premium materials to ensure optimal performance
- Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
- Refer to our online catalog for detailed application-specific information
Cloyes Gear – Engine Timing Crankshaft Sprocket (Part No.S391)
from
$8.49
Sprocket Made From High Alloy Material. Sprocket Teeth Are Heat Treated. Precision Tooth Form To Assure Proper Chain Engagement, And Precise Keyway To Tooth Timing.
Product Features:
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Product Features:
- Featuring precision-tooled or machined tooth form and precision-machined bore for true fit, timing chain sprockets offer reliability and dependability for engine rebuilds and typical replacement jobs
- Recommended that the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced, as these components play a vital role in system stability and accurate timing
- CAD designed and manufactured using premium materials
- Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
- Refer to our online catalog for detailed application-specific information
Cloyes Gear – Engine Timing Gear Set (Part No.2525S)
from
$43.99
Aluminum cam gear, steel crank gear. feature “helical” tooth form for quiet operation, and precision machined bore for true fit. SET INCLUDES: 2524 Engine Timing Camshaft Gear (1 EA), 2537 Engine Timing Crankshaft Gear (1 EA).
Product Features:
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Product Features:
- Utilizes the latest in design and technology to offer complete chain sets
- CAD designed and manufactured using premium materials
- Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
- Meet or exceed OEM performance requirements, ensuring a quiet and maintenance-free experience
- Refer to our online catalog for detailed application-specific information
Cloyes Gear – Engine Timing Crankshaft Gear (Part No.2537)
from
$17.99
Gear Made From High Alloy Material. Features “Helical” Tooth Form For Quiet Operation, And Precision Machined Bore For True Fit.”
Product Features:
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Product Features:
- Featuring precision-tooled or machined tooth form and precision-machined bore for true fit, timing chain gears offer reliability and dependability for engine rebuilds and typical replacement jobs
- Helical tooth form for quiet operation and precision machined bore for true fit
- CAD designed and manufactured using premium materials to ensure optimal performance
- Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
- Refer to our online catalog for detailed application-specific information
Cloyes Gear – Engine Timing Crankshaft Gear (Part No.2527)
from
$25.99
Gear Made From High Alloy Material. Features “Helical” Tooth Form For Quiet Operation, And Precision Machined Bore For True Fit.”
Product Features:
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Product Features:
- Featuring precision-tooled or machined tooth form and precision-machined bore for true fit, timing chain gears offer reliability and dependability for engine rebuilds and typical replacement jobs
- Helical tooth form for quiet operation and precision machined bore for true fit
- CAD designed and manufactured using premium materials to ensure optimal performance
- Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
- Refer to our online catalog for detailed application-specific information
Edelbrock – Timing Cover SBC Stamped Steel W/Welded Star & Logo Chrome (Part No.4860)
from
$34.99
Edelbrock part #4860 S/B Chevy Chrome Timing Cover (with Welded Reinforcement Plate) This stamped steel timing covers for small-block Chevrolet has a reinforcement plate welded to the inside of the cover for added strength. This timing cover is ideal for
Product Features:
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Product Features:
- Stamped Steel Material
- Comes W/ Front Crankshaft Seal Installed
- W/ Welded Reinforcement Plate
- Chrome Finish
- Ideal For Preventing Camshaft Walk When Used W/ Thrust Button
Competition Cams – Timing Cover, Small Block Chevy 3 Piece Billet 1 Ea (Part No.310)
from
$379.99
The COMP Cams Three-Piece Billet Aluminum Timing Cover for Small Block Chevrolet engines allows access to the camshaft timing adjustments without having to remove the harmonic damper or disturb the oil pan seal. Designed to be lightweight yet rigid, this billet cover offers convenience and performance in one easy-to-install package.
Product Features:
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Product Features:
- Allows access to the camshaft timing adjustments without having to remove the harmonic damper or disturb the oil pan seal
- Lightweight yet rigid
- Easy to install
- For Small Block Chevrolet applications
Popular 1970 Checker Marathon Engine Timing Parts Categories
Most Popular Timing Cover Seals for 1970 Checker Marathons
Enhance your 1970 Checker Marathon with one of the 2 Timing Cover Seals we have in stock, starting at just $15.99.
National – Engine Harmonic Balancer Kit (Part No.5000)
from
$28.99
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
Product Features:
See More
Product Features:
- Includes timing cover seal and harmonic balancer sleeve
- Solves the oil leaking around timing cover seal
- Made of stainless steel
- Takes up gaps caused by worn-out harmonic balancer shafts
MAHLE Original – Engine Timing Cover Seal (Part No.65022)
from
$15.99
MAHLE® gaskets provide world class sealing products trusted by OEMs & Technicians around the globe.
Product Features:
See More
Product Features:
- All MAHLE gaskets meet or exceed the original equipment specifications providing the finest sealing products available
- MAHLE gaskets utilizes OE equivalent or better materials in all our gaskets
- MAHLE gaskets is the leader in Domestic, Asian and European applications
- The contents of MAHLE gaskets are packaged in shrink wrapped tray, giving you the added security of knowing that you have the right parts, prior to opening the package
Best-Selling 1970 Checker Marathon Timing Cam Gears
Upgrade your Marathon with one of our 2 best-selling Timing Cam Gears.
Cloyes Gear – Engine Timing Camshaft Sprocket (Part No.S390T)
from
$11.99
Sprocket Made From High Alloy Material. Features Precision Tooth Form To Assure Proper Chain Engagement, And Is Balanced For Proper Timing.
Product Features:
See More
Product Features:
- Featuring precision-tooled or machined tooth form and precision-machined bore for true fit, timing chain sprockets offer reliability and dependability for engine rebuilds and typical replacement jobs
- Recommended that the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced, as these components play a vital role in system stability and accurate timing
- CAD designed and manufactured using premium materials
- Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
- Refer to our online catalog for detailed application-specific information
Cloyes Gear – Engine Timing Camshaft Gear (Part No.2524)
from
$37.99
Lightweight Aluminum Construction. Features Helical Tooth Form For Quiet Operation, And Precision Machined Bore For True Fit.
Product Features:
See More
Product Features:
- Featuring precision-tooled or machined tooth form and precision-machined bore for true fit, timing chain gears offer reliability and dependability for engine rebuilds and typical replacement jobs
- Helical tooth form for quiet operation and precision machined bore for true fit
- CAD designed and manufactured using premium materials to ensure optimal performance
- Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
- Refer to our online catalog for detailed application-specific information
Top-Quality Timing Covers for 1970 Checker Marathons
Choose a high-quality OEM or aftermarket Timing Cover for Checker Marathons and enjoy top-notch performance from $34.99.
Edelbrock – Timing Cover SBC Stamped Steel W/Welded Star & Logo Chrome (Part No.4860)
from
$34.99
Edelbrock part #4860 S/B Chevy Chrome Timing Cover (with Welded Reinforcement Plate) This stamped steel timing covers for small-block Chevrolet has a reinforcement plate welded to the inside of the cover for added strength. This timing cover is ideal for
Product Features:
See More
Product Features:
- Stamped Steel Material
- Comes W/ Front Crankshaft Seal Installed
- W/ Welded Reinforcement Plate
- Chrome Finish
- Ideal For Preventing Camshaft Walk When Used W/ Thrust Button
Top Picks for 1970 Checker Marathon Timing Sets
Invest in one of our 4 durable Timing Sets for your 1970 Checker, knowing you’re getting trusted brands and expert craftsmanship.
Competition Cams – 3-Piece Timing Gear Set With Fully Adjustable Camshaft And Crank Sprockets (Part No.160001)
from
$82.99
Features 3 ways of optional timing adjustment. The Zoom Timing Gear Set features nodular iron sprockets and a dual-row roller chain for accuracy and durability.
See More
Cloyes Gear – Engine Timing Set (Part No.C-3001K)
from
$27.99
Utilizes the latest in design and technology to offer complete chain sets. CAD designed and manufactured using premium materials. Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance. Utilizes the latest in design and technology to offer complete chain sets. Refer to our online catalog for detailed application-specific information. SET INCLUDES: S390T Engine Timing Camshaft Sprocket (1 EA), S391 Engine Timing Crankshaft Sprocket (1 EA), C499 Engine Timing Chain (1 EA).
Product Features:
See More
Product Features:
- Timing Set includes all components for a quick and efficient replacement
- CAD designed and manufactured using premium materials
- Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
- Utilizes the latest in design and technology to offer complete chain sets
- Refer to our online catalog for detailed application-specific information
Edelbrock – Victor-Link Adjustable True-Roller Timing Chain Set (Part No.7880)
from
$178.99
Product Features:
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- Keyway Adjustable
- Double Roller Timing Chain Type
- Induction Hardened Billet Steel Material
- 9-Keyway Setting Points
- For Chevys Opperating in 6500-8500 RPM Range
Competition Cams – Solid Lifter for Cadillac 472-500 and Chevrolet (Part No.813-1)
from
$15.99
Solid Lifter for Cadillac 472-500 and Chevrolet
Timing Chains for 1970 Checker Marathons
Make a smart move for your 1970 Checker Marathon with products all priced from $22.99 to $32.99.
Cloyes Gear – Engine Timing Chain (Part No.C499)
from
$22.99
Since 1921, Cloyes has been the trusted leader in automotive timing systems. Our timing chains are built to synchronize crankshaft and camshaft rotation with absolute accuracy, ensuring precise valve timing and long-term engine performance. Available as stand-alone chains or in complete kits, Cloyes timing chains are manufactured from premium materials, heat-treated, pre-stressed and engineered for a perfect chain-to-sprocket tooth fit – delivering quiet operation, durability, and OE-level performance you can count on. To ensure total timing system integrity, Cloyes recommends replacing the chain along with the tensioners, guides, and sprockets during service. Trusted by professionals for over a century & backed by an industry-leading limited Warranty and technical support.
Product Features:
See More
Product Features:
- Pre-stressed and heat-treated steel construction for increased strength, and wear resistance, delivering long-term durability even in high-stress environments
- Cloyes chains are engineered and manufactured with precision pitch control to ensure optimal chain-to-sprocket fit reducing noise, minimizing fatigue, and maintaining accurate timing
- Designed in the USA and manufactured using premium materials for OE-level fit and function, allowing for smooth installation and reliable performance
- Each part is extensively tested for function, fitment, and durability to ensure consistent quality and optimal performance, reducing the risk of comebacks
- Available in application-specific kit or as a stand-alone chain, offering installation flexibility and convenience
- Backed by Limited Lifetime Warranty and over 100 years in engineering leadership with unmatched technical support and repair confidence in every component
INA US – ENGINE TIMING CHAIN (Part No.ZC-C499)
from
$32.99
ENGINE TIMING CHAIN
Top-Rated Engine Timing Part Brands For Your 1970 Checker Marathon
When it comes to finding the perfect Engine Timing Part for your 1970 Checker Marathon, 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 Engine Timing Part brands including National and Competition Cams, and more, all known for their exceptional customer ratings (average brand rating of 4.3 stars) and competitive prices, as low as $18.79. Purchasing a Engine Timing Part from us here at Advance Auto Parts is a smart move for both you and your 1970 Checker Marathon, providing peace of mind with parts that meet or exceed OEM standards.
Popular National 1970 Checker Marathon Engine Timing Parts
If you’re looking for a top-quality Engine Timing Part for your 1970 Checker Marathon, Advance Auto Parts has exactly what you need with our selection of National Engine Timing Parts. We have 1 National Engine Timing Parts in stock for this fitment, all known for their durability and precision fit. With prices starting at just $18.79, you’ll find the perfect Engine Timing Part for your needs and budget. National Engine Timing Parts for the 1970 Checker Marathon come highly rated, with over 5 customer reviews and an impressive average rating of 4.3 stars. Choosing a National Engine Timing Part from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.
Top-Quality Competition Cams 1970 Checker Marathon Engine Timing Parts
For those in search of a high-quality Engine Timing Part for their 1970 Checker Marathon, Advance Auto Parts offers a great selection of Competition Cams Engine Timing Parts. With 1 Competition Cams Engine Timing Parts in stock, you can trust you’re getting top-tier parts designed for durability and a perfect fit. Prices for these Engine Timing Parts start at just $82.99, giving you a range of options to suit your budget. Backed by over 9 customer ratings and an average rating of 4.1 stars, Competition Cams Engine Timing Parts provide both reliability and excellent performance. Choosing a Competition Cams Engine Timing Part from Advance Auto Parts is a smart investment in your vehicle’s performance and longevity.
from
$82.99
(9)
3-Piece Timing Gear Set With Fully Adjustable Camshaft And Crank Sprockets
“Great quality product at a decent price”
FAQs for 1970 Checker Marathon Engine Timing Parts
What are the best-selling Engine Timing Parts for 1970 Checker Marathons?
Out of 22 Engine Timing Parts that fit 1970 Checker Marathons, the following parts are the top sellers:
- Engine Timing Chain (12152772) – $22.99
- Engine Harmonic Balancer Kit (18444501) – $28.99
- Engine Timing Set (12149403) – $27.99
What’s the price range for 1970 Checker Marathon Engine Timing Parts?
The prices of Engine Timing Parts for the 1970 Checker Marathon range from $8.49 up to $589.99 for the most premium parts.
What is the average price of an Engine Timing Part for a 1970 Checker Marathon?
The average price for Engine Timing Parts for the 1970 Checker Marathon is $104.73. Keep in mind the variety of part types within our Engine Timing Part category, where you are likely to find a wide range of prices across a variety of parts and components.
Does Advance Auto Parts sell Engine Timing Parts for other Checker Marathon model years?
What are the cheapest Engine Timing Parts for my 1970 Checker Marathon?
The cheapest 1970 Checker Marathon Engine Timing Parts we carry are:
- Engine Timing Crankshaft Sprocket (12154850) – $8.49
- Engine Timing Camshaft Sprocket (12154856) – $11.99
- Engine Timing Cover Seal (11155889) – $15.99
- Solid Lifter for Cadillac 472-500 and Chevrolet (50289510) – $15.99
- Engine Timing Crankshaft Gear (12152594) – $17.99
Does Advance Auto Parts sell Engine Timing Parts for any other 1970 Checker models?
Yes. We stock Engine Timing Parts for 4 other popular 1970 Checker models. Some of the most popular are 1970 Deluxe Engine Timing Parts, 1970 Aerobus Engine Timing Parts, 1970 Taxicab Engine Timing Parts, 1970 A11E Engine Timing Parts, and 1970 A11 Engine Timing Parts.
What are the top-rated Engine Timing Parts that fit the 1970 Checker Marathon?
The one 1970 Checker Marathon Engine Timing Part we have in stock is the Engine Timing Crankshaft Sprocket. It costs $8.49.
What types of Engine Timing Parts do you sell for my 1970 Checker Marathon?
As of 3/1/26, these are some of the most in-demand types of Engine Timing Parts for a 1970 Checker Marathon:
Can I get help with 1970 Checker Marathon Engine Timing Part orders?
Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about Checker Engine Timing Parts and more.
What is your return policy for Checker Marathon Engine Timing Parts?
Advance Auto Parts keeps returns simple. For new Checker Marathon Engine Timing Parts and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.