Looking for the best 2-piece rear main seal flexplates for your classic Chevy engine? We’ve compiled a list of top 10 reliable options to ensure smooth and safe engine performance.
Looking for reliable flexplates for your classic Chevy engine? You’re in the right place. These parts keep your engine and transmission working smoothly and safely.
Flexplates matter. They handle power transfer, balance, and starter engagement. The right one fits your engine’s specs—like tooth count, bolt patterns, and balance type. Always check details before buying.
This guide cuts through the noise. We picked top flexplates built for strength, compatibility, and long-lasting use. Think durable steel, precise fits, and easy installs. Let’s dive in.
List of Top 10 2 Piece Rear Main Seal Flexplates
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Speedway Motors 153 Tooth Flexplate for Two-Piece Rear Main Seal Motors Internal Balance Design with Dual 9-3/4 and 10-3/4 Inch Converter Bolt Patterns, Compatible with 55–85 Chevy |
This flexplate is perfect for 1955–1985 Chevy small block engines with a two-piece rear main seal and internal balance design. It suits builders needing dual torque converter patterns (9-3/4” and 10-3/4”) and durable steel construction for reliable engine or transmission installs. |
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Speedway Motors 1955-1985 Chevy Flexplate for 2-Piece Rear Main, 168 Tooth – Perfect for Engine/Transmission Installations – Small Block Chevy – Non SFI Rated |
This product is perfect for mechanics and DIY enthusiasts installing engines or transmissions in 1955–1985 Small Block Chevy vehicles. It suits two-piece rear main seal setups, offers 168 teeth for smooth power transfer, and fits dual bolt patterns (10-3/4″ and 11-1/2″) for easy compatibility. |
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1955-85 Compatible with Chevy Flexplate for 2-Piece Rear Main, 168 Tooth w/Bolts |
This flexplate is perfect for car enthusiasts and mechanics who are installing a new engine or transmission in a Chevy with a two-piece rear main seal. It’s easy to use and fits small block Chevy engines with 168 teeth. |
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Speedway Motors Flexplate 168 Tooth Compatible with Chevy Small Block 400 Engine Two Piece Rear Main Seal External Balance Dual Bolt Pattern Non SFI |
Perfect for Chevy small-block 400 builders and restorers needing a flexplate for engines with two-piece rear main seals. This 168-tooth ring gear with external balance and dual bolt patterns suits standard street-driven applications. |
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Speedway Motors 1955–85 SBC Flex Plate 168 Tooth for 2-Piece Rear Main Seal Engines Includes ARP High Strength Bolts Dual Bolt Pattern Steel Construction |
This product is perfect for car builders and engine enthusiasts working on 1955–1985 SBC engines with two-piece rear main seals. It’s ideal for those needing a durable flexplate with a dual bolt pattern to fit both street and performance setups, plus strong ARP bolts for reliable installation. |
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Speedway Motors SFI Certified 168 Tooth Flexplate Internal Balance for 1965–85 Applications, Two-Piece Rear Main Seal Engines, Steel Construction compatible with Chevy Motors |
This flexplate is perfect for Chevy engine builders and hot-rodders needing a strong, SFI-certified part for 1965–1985 engines with two-piece rear main seals. It works well for street or performance builds, ensuring proper starter engagement with its 168-tooth design. |
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Speedway Motors SFI Flexplate Compatible with Chevy 350 153 Tooth Steel for 2 Piece Rear Main Seal Internally Balanced Engines Fits TH350 with 2.5 Inch Center Hole |
This flexplate is perfect for car enthusiasts who want a strong and reliable part for their Chevy 350 engine. It’s great for TH350 transmissions and internally balanced engines, ensuring a smooth and safe performance. |
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Speedway Motors 1955–85 SBC Flex Plate 153 Tooth for 2-Piece Rear Main Seal Engines Includes ARP High Strength Bolts Dual Bolt Pattern Steel Design to Make Installation Easy |
This flexplate is perfect for car builders and mechanics working on 1955–1985 SBC engines with two-piece rear main seals. It’s ideal for those needing a durable steel design and ARP high-strength bolts for easy, reliable installation. |
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JEGS Heavy-Duty SFI 29.1 Flexplate | Compatible With Chevy Small Block 400 Engines 1970-1980 | 168-Tooth | Externally Balanced | Dual Converter Bolt Pattern | For 2-Piece Rear Main Seal |
This flexplate is perfect for Chevy 400 small block engine owners from 1970-1980 needing a strong, race-ready upgrade. It’s built for high-performance builds with its SFI 29.1 rating, dual bolt pattern for torque converter flexibility, and chromoly steel durability. |
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JEGS Heavy-Duty SFI 29.1 Flexplate | Fits 1970-1990 Chevy Big Block Mark IV 454 Engines | 168-Tooth | Externally Balanced | Dual Converter Bolt Pattern | For 2-Piece Rear Main Seal |
This product is perfect for car enthusiasts and racers with 1970-1990 Chevy Big Block 454 engines needing a reliable flexplate. It’s built for high-performance use with an SFI 29.1 rating and a dual converter bolt pattern to fit multiple setups. |
Detailed Reviews
Finding the perfect 2-piece rear main seal flexplate can make or break your Chevy engine build. We’ve reviewed top-rated options, from 153-tooth budget-friendly picks to SFI-certified high-performance plates, ensuring smooth starter engagement and strong durability. Each pick matches Chevy small-block or big-block engines (1955–1990) with dual bolt patterns for easy transmission swaps. Trust our expert guide to simplify your upgrade—no guesswork, just reliable power transfer.
1. Speedway Motors 153 Tooth Flexplate for Two-Piece Rear Main Seal Motors Internal Balance Design with Dual 9-3/4 and 10-3/4 Inch Converter Bolt Patterns, Compatible with 55–85 Chevy
This flexplate works with 1955–1985 Chevy small block engines using a two-piece rear main seal and internal balance design. It has a 153-tooth ring gear for reliable starter engagement and a 12.81-inch diameter for proper fit. The plate includes dual bolt patterns (9-3/4 and 10-3/4 inches) to match different torque converters.
Made from durable steel, it provides strength during engine or automatic transmission installations. Sold individually, it’s ideal for rebuilds or performance upgrades. The 2-1/2-inch center hole ensures correct alignment, but it’s not for use with external balance plates.
Always check your engine’s specs before buying. This flexplate is non-SFI certified, suited for standard street or hobby use.
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Perfect For:
This flexplate is perfect for 1955–1985 Chevy small block engines with a two-piece rear main seal and internal balance design. It suits builders needing dual torque converter patterns (9-3/4” and 10-3/4”) and durable steel construction for reliable engine or transmission installs.
Ready to Purchase?
2. Speedway Motors 1955-1985 Chevy Flexplate for 2-Piece Rear Main, 168 Tooth – Perfect for Engine/Transmission Installations – Small Block Chevy – Non SFI Rated
The Speedway Motors 1955-1985 Chevy Flexplate is perfect for engine or transmission installations. It’s designed for Small Block Chevy engines with a two-piece rear main seal.
This flexplate has 168 teeth for smooth transmission operation. It features dual bolt patterns (10-3/4″ and 11-1/2″) for easy compatibility. Its key dimensions ensure a precise fit every time.
With an outside diameter of 14.09″ and a center hole of 2-1/2″, it’s built for specific setups. This flexplate is non-SFI rated and ideal for upgrades or repairs. It adds flexibility to your vehicle projects.
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Perfect For:
This product is perfect for mechanics and DIY enthusiasts installing engines or transmissions in 1955–1985 Small Block Chevy vehicles. It suits two-piece rear main seal setups, offers 168 teeth for smooth power transfer, and fits dual bolt patterns (10-3/4″ and 11-1/2″) for easy compatibility.
Ready to Purchase?
3. 1955-85 Compatible with Chevy Flexplate for 2-Piece Rear Main, 168 Tooth w/Bolts
This flexplate fits 1955-85 Chevy engines with two-piece rear main seals. It works with 168-tooth setups and includes bolts for easy installation.
The exclusive flat 12-point head bolts are built for tight spaces. Each bolt has a .24″ thick head and 7/16″-20 threads. This design ensures a strong, secure fit for older Chevy engines.
Perfect for Small Block Chevy builds, it guarantees reliable performance. The flexplate simplifies upgrades for classic Chevy enthusiasts.
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Perfect For:
This flexplate is perfect for car enthusiasts and mechanics who are installing a new engine or transmission in a Chevy with a two-piece rear main seal. It’s easy to use and fits small block Chevy engines with 168 teeth.
Ready to Purchase?
4. Speedway Motors Flexplate 168 Tooth Compatible with Chevy Small Block 400 Engine Two Piece Rear Main Seal External Balance Dual Bolt Pattern Non SFI
The Speedway Motors Flexplate fits Chevy small block 400 engines with a two-piece rear main seal. It has a 168-tooth ring gear and external balance for starter compatibility.
Dual bolt patterns (10-3/4” and 11-1/2”) work with common automatic transmissions. Replace it when installing a new engine or transmission. The non-SFI rated design suits regular street use.
This flexplate measures 14-1/4 inches in diameter. Built for smooth performance and long-lasting use in everyday driving.
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Perfect For:
Perfect for Chevy small-block 400 builders and restorers needing a flexplate for engines with two-piece rear main seals. This 168-tooth ring gear with external balance and dual bolt patterns suits standard street-driven applications.
Ready to Purchase?
5. Speedway Motors 1955–85 SBC Flex Plate 168 Tooth for 2-Piece Rear Main Seal Engines Includes ARP High Strength Bolts Dual Bolt Pattern Steel Construction
Speedway Motors 1955–85 SBC Flex Plate fits 1955–1985 SBC engines with two-piece rear main seals. It has a 168-tooth design for internal balance and a 14.09″ diameter for common automatic transmissions. The flexplate includes ARP high-strength bolts for durability.
The dual bolt pattern supports both 10-3/4″ and 11-1/2″ converter setups, offering flexibility. Its steel construction ensures strength for street and performance use.
ARP hardware is rated at 200,000 PSI, with 12-point heads and larger shank diameters. This flexplate simplifies installation with all needed parts included.
| Pros | Cons |
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Perfect For:
This product is perfect for car builders and engine enthusiasts working on 1955–1985 SBC engines with two-piece rear main seals. It’s ideal for those needing a durable flexplate with a dual bolt pattern to fit both street and performance setups, plus strong ARP bolts for reliable installation.
Ready to Purchase?
6. Speedway Motors SFI Certified 168 Tooth Flexplate Internal Balance for 1965–85 Applications, Two-Piece Rear Main Seal Engines, Steel Construction compatible with Chevy Motors
This SFI Certified flexplate is built for strength and reliability. It works with Chevy engines from 1965–1985 that use a two-piece rear main seal. The 168-tooth design ensures proper starter engagement for automatic transmissions.
The flexplate is internally balanced, matching engines with internal balance setups. It’s made of steel for durability in high-performance or daily driving use.
For externally balanced engines like 383 or 400 cubic inch models, a balance plate is needed. It’s ideal for Chevy enthusiasts upgrading or repairing older small-block engines. Always confirm your engine’s balance type before installation.
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Perfect For:
This flexplate is perfect for Chevy engine builders and hot-rodders needing a strong, SFI-certified part for 1965–1985 engines with two-piece rear main seals. It works well for street or performance builds, ensuring proper starter engagement with its 168-tooth design.
Ready to Purchase?
7. Speedway Motors SFI Flexplate Compatible with Chevy 350 153 Tooth Steel for 2 Piece Rear Main Seal Internally Balanced Engines Fits TH350 with 2.5 Inch Center Hole
The Speedway Motors SFI Flexplate is built for Chevy 350 engines. It works with internally balanced setups and fits 2-piece rear main seals. This flexplate is SFI 29.1 certified for safety.
It has a 153-tooth ring gear and a 2.5-inch center hole. This design ensures a perfect fit for your crankshaft. It’s compatible with TH350 transmissions and most torque converters.
Made from cold-rolled chromoly steel, it’s stronger than stock units. The zinc-plated finish resists wear and tear. This flexplate is reliable and long-lasting.
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Perfect For:
This flexplate is perfect for car enthusiasts who want a strong and reliable part for their Chevy 350 engine. It’s great for TH350 transmissions and internally balanced engines, ensuring a smooth and safe performance.
Ready to Purchase?
8. Speedway Motors 1955–85 SBC Flex Plate 153 Tooth for 2-Piece Rear Main Seal Engines Includes ARP High Strength Bolts Dual Bolt Pattern Steel Design to Make Installation Easy
This flexplate fits 1955–1985 SBC engines with a two-piece rear main seal. Its 153-tooth design works with common automatic transmissions for easy setup.
Dual bolt patterns match multiple transmissions. Heavy-duty steel ensures strength. ARP bolts are high-grade and durable.
The complete package includes all needed parts. It’s built to create a strong, smooth drivetrain without extra hassle.
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Perfect For:
This flexplate is perfect for car builders and mechanics working on 1955–1985 SBC engines with two-piece rear main seals. It’s ideal for those needing a durable steel design and ARP high-strength bolts for easy, reliable installation.
Ready to Purchase?
9. JEGS Heavy-Duty SFI 29.1 Flexplate | Compatible With Chevy Small Block 400 Engines 1970-1980 | 168-Tooth | Externally Balanced | Dual Converter Bolt Pattern | For 2-Piece Rear Main Seal
This JEGS flexplate fits Chevy 400 small block engines from 1970 to 1980. It works with two-piece rear main seal setups. The SFI 29.1 rating meets most racing rules.
It has a dual torque converter bolt pattern for 10.75” and 11.5” converters. Chromoly steel makes it strong and long-lasting. The 168-tooth design ensures smooth power transfer.
Externally balanced to match your engine’s needs. Perfect for high-performance or daily driving builds.
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Perfect For:
This flexplate is perfect for Chevy 400 small block engine owners from 1970-1980 needing a strong, race-ready upgrade. It’s built for high-performance builds with its SFI 29.1 rating, dual bolt pattern for torque converter flexibility, and chromoly steel durability.
Ready to Purchase?
10. JEGS Heavy-Duty SFI 29.1 Flexplate | Fits 1970-1990 Chevy Big Block Mark IV 454 Engines | 168-Tooth | Externally Balanced | Dual Converter Bolt Pattern | For 2-Piece Rear Main Seal
JEGS Heavy-Duty SFI 29.1 Flexplate is built for 1970-1990 Chevy Big Block Mark IV 454 engines. It meets strict SFI 29.1 safety standards for racing use.
Dual torque converter bolt patterns fit both 10.75″ and 11.5″ converters. The 168-tooth design is externally balanced for smooth performance. Made from chromoly steel, it lasts long even under heavy stress.
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Perfect For:
This product is perfect for car enthusiasts and racers with 1970-1990 Chevy Big Block 454 engines needing a reliable flexplate. It’s built for high-performance use with an SFI 29.1 rating and a dual converter bolt pattern to fit multiple setups.
Ready to Purchase?
Buying Guide
Looking for reliable flexplates for your classic Chevy engine? These parts keep your engine and transmission working smoothly and safely. Get the right fit for your build with this expert guide.
- Tooth Count: The number of teeth affects starter engagement and transmission smoothness. Choose 153 or 168 teeth based on your engine’s design and starter setup.
- Bolt Patterns: Dual bolt patterns (like 9-3/4” and 10-3/4”) ensure compatibility with multiple torque converters. Check your transmission specs before buying.
- Balance Type: Internal or external balance matters. Match your engine’s balance type to avoid vibrations or damage.
- Material Quality: Steel flexplates offer strength and durability, while chromoly steel adds extra toughness for high-performance builds.
- SFI Certification: For racing or high-stress use, pick SFI-certified flexplates to meet safety standards. Non-certified ones work for daily drivers.
- Engine Compatibility: Confirm fit with your engine’s year, model, and two-piece rear main seal setup. Specs like center hole size and diameter are key.
- Included Hardware: Look for kits with ARP bolts or high-strength fasteners for secure installation. Flat 12-point heads fit tight spaces easily.
Always double-check your engine’s specs before buying. The right flexplate ensures a smooth drivetrain and long-term reliability. Pick based on your build’s needs—street driving, racing, or classic restoration.