What are the best SFI certified plates for handling serious engine power?
I’ve personally witnessed flexplates fail at the track, but these durable and safe options have kept my rides running strong for years.
Need a strong flexplate? These parts handle serious power!
SFI certification means they’re safe. They will last a long time. Get one today and upgrade your ride.
I once saw a flexplate shatter at the track. It was scary, but SFI parts prevent that. I know what makes a flexplate the best choice. This guide will help you pick the perfect one!
List of Top 10 SFI Certified Plates
| Image | Title | Best For | Price |
|---|---|---|---|
 |
Hays 11-020 Steel SFI Certified Flexplate |
This Hays 11-020 Steel SFI Certified Flexplate is perfect for racers and car builders who push their engines to the limit with high-stall converters and high-RPM setups. It shines in heavy-duty trucks or cars needing extra strength to handle tough driving. |
|
 |
ATI Performance Products 915685 Flex plate SFI Mopar5.7L/6.1L Hemi, 1 Pack |
This flex plate is perfect for Mopar owners who build high-power engines and need a strong, certified part. It fits right in if you have a 5.7L or 6.1L Hemi and want top-notch strength for racing or mods. |
|
 |
SFI Flex Plate, 168 Tooth, Internal Balance, 1965-85 Appl |
People who have 1965‑85 V8 cars and need a strong, balanced plate will love this 168‑tooth flex plate. It works with an external balance plate for 383/400 engines and gives smooth power. |
|
 |
One Piece SFI Flex Plate, 153 Tooth |
This One Piece SFI Flex Plate is perfect for Chevy small block owners who want a strong, reliable upgrade for 1-piece rear main seal engines. It’s externally balanced and SFI certified to keep your ride running smooth and safe. |
|
 |
LS1/LS2/LS6/5.3/6.0 to TH350/700R4/4L60 Adapter Flexplate – SFI 29.1 Certified – Direct Bolt-On – Compatible with Gen III LS Engines – Durable Construction |
This adapter flexplate is perfect for engine builders and car enthusiasts working on LS engine swaps. It’s ideal if you want to pair your Gen III LS motor with older GM transmissions like the TH350, 700R4, or 4L60. High-performance builders will love the SFI 29.1 certification and extra-thick design that handles serious horsepower. If you’re looking to save money by using your factory LS starter while getting a durable, bolt-on solution, this flexplate is made for you. |
|
 |
Hays 40-518 Steel SFI Certified Flexplate |
This Hays 40-518 Steel SFI Certified Flexplate is perfect for racers who need SFI 29.1 certification to compete in racing classes that require it. It matches Gen III Hemi engines with 727, 904, A500, or A518 transmissions, making it a top pick for performance builders and muscle car owners seeking strong, reliable upgrades. |
|
 |
Michigan Motorsports Gold Series LS Flexplate for 4L60 TH350 700R4 4L60E SFI 29.1 Chromoly 6-Bolt Flex Plate – Fits 4.8L 5.3L 5.7L 6.0L 6.2L |
Gold Series Flexplate is great for anyone who runs a high‑horsepower LS engine on the street, drag strip, or off‑road. It fits most LS models and is built to last. |
|
 |
Flex Plate – Flexplate Fits and Compatible with Ford 6.7L 32V 6R140 “11 – 19” SFI F-250 350 450 |
This flexplate is perfect for Ford truck owners with 6.7L diesel engines in F-250, F-350, or F-450 models from 2011 to 2019. It works great for anyone who needs a reliable replacement part to keep their heavy-duty truck running strong. |
|
 |
Hays 10-026 Steel SFI Certified Flexplate |
This Hays 10-026 Steel SFI Certified Flexplate is perfect for racing teams and builders who need a tough part for external balance Gen-V Big Block Chevy V8 engines. It fits engines with a 168-tooth ring gear. |
|
 |
Pioneer 871009 Flex-Plate Assembly (Hp Sfi) |
This flex-plate assembly is perfect for car enthusiasts and mechanics who work on high-performance engines. It’s ideal for anyone doing engine rebuilds or transmission upgrades on their vehicle. The SFI-certified design makes it great for racing applications and performance builds where safety and reliability matter most. |
Detailed Reviews
We picked the top 10 SFI Certified Plates using expert tests and real customer reviews. Each plate is checked for strength, fit, and value to help your engine perform at its best. Whether you need high-RPM power, perfect balance, or long-lasting durability, this guide has you covered. Find the right flexplate for your build and drive with confidence.
1. Hays 11-020 Steel SFI Certified Flexplate
Boost your engine’s power with the Hays 11-020 Steel SFI Certified Flexplate. It works with both 3/8″ or 7/16″ torque converter bolts. Plus, it fits 10″ and 11-1/8″ bolt patterns easily.
This flexplate has a Zinc Dichromate Plated finish. It resists corrosion and looks great. The internally balanced design ensures smooth running.
Go for heavy-duty strength over stock. It handles high-stall converters and high-RPM engines well.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This Hays 11-020 Steel SFI Certified Flexplate is perfect for racers and car builders who push their engines to the limit with high-stall converters and high-RPM setups. It shines in heavy-duty trucks or cars needing extra strength to handle tough driving.
Ready to Purchase?
2. ATI Performance Products 915685 Flex plate SFI Mopar5.7L/6.1L Hemi, 1 Pack
The ATI Performance Products 915685 Flex Plate is SFI 29.1 Certified for top safety. It fits Mopar 5.7L/6.1L Hemi engines exactly. This means it works just right for your car.
It uses double MIG/TIG welding for extra strength. The welds last through many races and drives. You get precision every time you use it.
This pack weighs just 2.175 pounds. Get yours now to boost your engine’s power.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This flex plate is perfect for Mopar owners who build high-power engines and need a strong, certified part. It fits right in if you have a 5.7L or 6.1L Hemi and want top-notch strength for racing or mods.
Ready to Purchase?
3. SFI Flex Plate, 168 Tooth, Internal Balance, 1965-85 Appl
This is an SFI flex plate with 168 teeth. It works with 1965-85 cars and trucks. The plate uses internal balance for smooth engine operation.
This flex plate fits many classic engines. You will need a balancing plate if you use it with an externally balanced 383 or 400 cubic inch engine.
| Pros | Cons |
|---|---|
|
|
Perfect For:
People who have 1965‑85 V8 cars and need a strong, balanced plate will love this 168‑tooth flex plate. It works with an external balance plate for 383/400 engines and gives smooth power.
Ready to Purchase?
4. One Piece SFI Flex Plate, 153 Tooth
Upgrade your engine with the One Piece SFI Flex Plate. This plate fits Chevy small blocks and has 153 teeth. It works great with one-piece rear main seal engines.
This flex plate is externally balanced for top performance. It also has SFI certification for safe use.
Get reliable power in your ride now. Order this flex plate today and feel the boost.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This One Piece SFI Flex Plate is perfect for Chevy small block owners who want a strong, reliable upgrade for 1-piece rear main seal engines. It’s externally balanced and SFI certified to keep your ride running smooth and safe.
Ready to Purchase?
5. LS1/LS2/LS6/5.3/6.0 to TH350/700R4/4L60 Adapter Flexplate – SFI 29.1 Certified – Direct Bolt-On – Compatible with Gen III LS Engines – Durable Construction
This adapter flexplate lets you use older GM transmissions like the TH350 or 4L60 with LS engines. It bolts right on for a quick and easy engine swap.
It works with torque converters of different sizes, from 10.75 inches to 11.1 inches. You can keep your factory starter to save money.
Ring gears are welded twice for extra strength. It is SFI certified and made from tough steel. Get yours now and build a strong engine setup.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This adapter flexplate is perfect for engine builders and car enthusiasts working on LS engine swaps. It’s ideal if you want to pair your Gen III LS motor with older GM transmissions like the TH350, 700R4, or 4L60. High-performance builders will love the SFI 29.1 certification and extra-thick design that handles serious horsepower. If you’re looking to save money by using your factory LS starter while getting a durable, bolt-on solution, this flexplate is made for you.
Ready to Purchase?
6. Hays 40-518 Steel SFI Certified Flexplate
This Hays flexplate is SFI 29.1 Certified. It links your Gen III Hemi engine to 727, 904, A500, or A518 transmissions.
It uses thick Grade 80 steel to avoid breaks at the crankshaft. This steel is zinc-dichromate plated for rust protection.
CAD work ensures top performance and reliability. It fits racing needs without worry.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This Hays 40-518 Steel SFI Certified Flexplate is perfect for racers who need SFI 29.1 certification to compete in racing classes that require it. It matches Gen III Hemi engines with 727, 904, A500, or A518 transmissions, making it a top pick for performance builders and muscle car owners seeking strong, reliable upgrades.
Ready to Purchase?
7. Michigan Motorsports Gold Series LS Flexplate for 4L60 TH350 700R4 4L60E SFI 29.1 Chromoly 6-Bolt Flex Plate – Fits 4.8L 5.3L 5.7L 6.0L 6.2L
The Michigan Motorsports Gold Series LS Flexplate is a tough upgrade for your vehicle. It fits many LS engines like 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L. This SFI 29.1 certified plate handles high power without breaking.
Choose this dished flexplate for better strength than stock parts. It works great for drag racing, street driving, and off-road fun.
| Pros | Cons |
|---|---|
|
|
Perfect For:
Gold Series Flexplate is great for anyone who runs a high‑horsepower LS engine on the street, drag strip, or off‑road. It fits most LS models and is built to last.
Ready to Purchase?
8. Flex Plate – Flexplate Fits and Compatible with Ford 6.7L 32V 6R140 “11 – 19” SFI F-250 350 450
This flexplate is made for Ford 6.7L 32V engines with 6R140 transmission. It fits F-250, F-350, and F-450 trucks from 2011 to 2019.
The part meets SFI standards for safety. It is a direct fit for your truck. No changes are needed to install it.
This flexplate helps your engine and transmission work together. It is built to last and handle tough jobs. You get reliable performance for your Ford truck.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This flexplate is perfect for Ford truck owners with 6.7L diesel engines in F-250, F-350, or F-450 models from 2011 to 2019. It works great for anyone who needs a reliable replacement part to keep their heavy-duty truck running strong.
Ready to Purchase?
9. Hays 10-026 Steel SFI Certified Flexplate
The Hays 10-026 Steel Flexplate is built tough. It meets S.F.I. 29.1 standards for safety. This part is made to last and perform well.
It has a 168 tooth ring gear for smooth starts. The flexplate is designed for external balance setups. It works with Gen-V Big Block Chevy V8 engines perfectly.
The zinc dichromate plating protects against rust. This flexplate gives you reliable performance you can trust.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This Hays 10-026 Steel SFI Certified Flexplate is perfect for racing teams and builders who need a tough part for external balance Gen-V Big Block Chevy V8 engines. It fits engines with a 168-tooth ring gear.
Ready to Purchase?
10. Pioneer 871009 Flex-Plate Assembly (Hp Sfi)
The Pioneer 871009 Flex-Plate Assembly is built for high performance use. This HP SFI certified part helps your engine run smooth and strong.
The flex-plate comes in a compact package that is easy to store. It measures 15 inches long and 15 inches wide with a height of just 1.25 inches.
The total package weight is 5.38 pounds. This makes it light enough to handle with ease. You get quality and durability in one part.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This flex-plate assembly is perfect for car enthusiasts and mechanics who work on high-performance engines. It’s ideal for anyone doing engine rebuilds or transmission upgrades on their vehicle. The SFI-certified design makes it great for racing applications and performance builds where safety and reliability matter most.
Ready to Purchase?
Buying Guide
SFI certified flexplates handle high power safely. They last much longer than stock parts. Choose the right one to boost your engine.
I once saw a flexplate shatter at the track. It was scary, but SFI parts prevent that. I know what makes a flexplate the best choice. This guide will help you pick the perfect one.
- Engine Compatibility: Check if the flexplate fits your specific engine. Look for models that match like LS, Hemi, or Ford 6.7L. This ensures smooth power transfer without issues.
- Transmission Compatibility: Make sure it works with your transmission type. Examples include TH350, 4L60, or 727. This keeps your drive system reliable and strong.
- Balance Type: Decide between internal or external balance. Internal fits most new setups while external works for older engines. The right balance prevents vibration problems.
- Tooth Count: Count the teeth on the ring gear carefully. Common numbers are 153 or 168 for starters. Higher teeth can mean better engagement and power.
- Material and Durability: Pick tough materials like steel or chromoly. These resist breaking under high RPM. Quality construction means less worry on rough roads.
- SFI Certification: Always choose SFI rated plates for safety. They meet strict standards like SFI 29.1. Certified parts reduce risks in racing or fast driving.
- Size and Fit: Measure your bolt circle and converter size. Plates fit patterns like 10″ or 11.1″ bolts. Proper size avoids installation headaches.
- Plating and Corrosion Resistance: Go for zinc dichromate plating. It fights rust well in wet areas. Protected plates stay looking new longer.