Best Chevy 383 400 Flexplates

Looking for the best flexplates for your Chevy 383 or 400 engine?
SFI-rated flexplates deliver unmatched durability, double-welded teeth, and heavy-duty materials for high-performance builds, ensuring smooth power delivery and race-ready reliability with easy installation.

Looking for a stronger flexplate for your Chevy 383 or 400 engine? SFI-rated options deliver the toughness and reliability needed for high-performance builds.

These flexplates are built to last, handle extreme power, and ensure smooth power delivery. Double-welded teeth and heavy-duty materials make them race-ready. Proper fit and easy installation guarantee confidence under pressure.

List of Top 9 Chevy 383 400 Flexplates

Title	Best For	Price
PRW 1840000 SFI-Rated External Balance 168 Teeth Chromoly Steel Flexplate for Chevy 400/383 1970-80 Early	This flexplate is perfect for racers who need reliable performance. It’s built tough for high-stress engines and exceeds OEM standards.	View on Amazon (paid link)
Speedmaster PCE226.1003 Compatible with Chevy SBC 383 400 2Pc Rms 168 Tooth 11″ External Balance Heavy Duty Flexplate	This Speedmaster PCE226.1003 Flexplate is perfect for car enthusiasts who want reliable performance. It’s ideal for Chevy SBC 383 and 400 engines, offering durability and precision.	View on Amazon (paid link)
Speedway Motors Flexplate 168 Tooth Compatible with Chevy Small Block 400 Engine Two Piece Rear Main Seal External Balance Dual Bolt Pattern Non SFI	This flexplate is perfect for car enthusiasts who want to upgrade their Chevy small block 400 engine. It’s ideal for standard street-driven applications, ensuring reliable operation with its dual bolt patterns and external balance.	View on Amazon (paid link)
Automatic Transmission 168 tooth Flexplate+ HP bolts compatible with Chevy 383 400 External Balanced (Flywheel + Bolts)	This product is perfect for Chevy 383 or 400 engine builders needing a durable, external balanced flexplate. It’s ideal for those upgrading to a 168-tooth ring gear with a 2-piece rear main seal setup.	View on Amazon (paid link)
PRW 1835001 SFI-Rated Internal Balance 168 Teeth Chromoly Steel Flexplate for Chevy 1957-85, 90 Early, V6, Gold Irridate	This flexplate is perfect for racers and high-performance Chevy engine builders needing SFI 29.1 certified strength. Its 0.035 inch thicker design, double-welded ring gears, and racing-focused build exceed OEM specifications, ensuring durability under extreme torque and RPM.	View on Amazon (paid link)
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 Speedway Motors SFI Flexplate is perfect for anyone building or upgrading a Chevy 350 engine with a 2-piece rear main seal. It’s built tough with SFI 29.1 certification and heavy-duty steel for TH350 transmissions.	View on Amazon (paid link)
Scat FP-400 Flexplate S/B Chevy 168 Tooth External	The Scat FP-400 Flexplate is perfect for high-performance engines. It’s built tough to handle extreme power, making it ideal for racers and enthusiasts.	View on Amazon (paid link)
SFI Small Block for Chevy 383/400 External Balance Flexplate 168 Tooth Bolts	This SFI Small Block Flexplate is perfect for car enthusiasts and mechanics who need a reliable, high-performance part for their Chevy 383/400 engine. It’s easy to install and works great for upgrades or replacements.	View on Amazon (paid link)
ERSGRP Automatic Transmission Flexplate-Auto Trans Flexplate 1pc for Olds,for GMC,for Chevy,for Cadillac,for Buick FRA-159 10128414	This product is perfect for DIY mechanics or car owners with older Buick, Cadillac, Chevy, or GMC models needing a durable replacement flexplate. It fits vehicles from 1990-2000 and meets industry quality standards for reliable performance.	View on Amazon (paid link)

Detailed Reviews

Discover the top 9 Chevy 383 400 Flexplates in this expert-reviewed guide. Each product is handpicked for performance, durability, and value, ensuring you find the perfect fit for your needs. Whether you’re racing or daily driving, this guide has you covered!

1. PRW 1840000 SFI-Rated External Balance 168 Teeth Chromoly Steel Flexplate for Chevy 400/383 1970-80 Early

Unleash the power of your Chevy with the PRW 1840000 Flexplate. This high-performance part is built for serious racing.

It’s SFI 29.1 certified. This flexplate is tougher than stock. It’s made for racing.

Get superior strength and reliability. Double-welded ring gears handle high RPMs. Upgrade your engine today!

Pros	Cons
Race-ready with SFI 29.1 certification. Stronger than stock for extreme performance. Built tough for racing demands. Double-welded gears handle high torque. Exceeds original quality for lasting power.	Not for daily use, designed for racing only. Thicker design may require engine adjustments. Higher cost than standard flexplates.

Perfect For:

This flexplate is perfect for racers who need reliable performance. It’s built tough for high-stress engines and exceeds OEM standards.

Ready to Purchase?

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2. Speedmaster PCE226.1003 Compatible with Chevy SBC 383 400 2Pc Rms 168 Tooth 11″ External Balance Heavy Duty Flexplate

The Speedmaster PCE226.1003 is a heavy-duty flexplate designed for Chevy SBC 383 400 engines. It features a 2-piece RMS design and a 168-tooth, 11-inch external balance. This flexplate is built to handle high-performance demands.

Speedmaster combines old and new technology to create unique, durable products. Their empowered team drives innovation in both product design and production methods.

With a 12-month limited worldwide warranty, this Track Proven flexplate ensures reliability on the road, race, and recreation. It’s a trusted choice for performance enthusiasts.

Pros	Cons
Heavy-duty design ensures long-lasting performance for your engine. Track-proven reliability for road, race, and recreation. 12-month warranty offers peace of mind worldwide. Unique DNA blends old and new technology for standout quality.	Limited Compatibility – Only fits Chevy SBC 383/400 engines. Heavier Design May Hinder Quick Swaps.

Perfect For:

This Speedmaster PCE226.1003 Flexplate is perfect for car enthusiasts who want reliable performance. It’s ideal for Chevy SBC 383 and 400 engines, offering durability and precision.

Ready to Purchase?

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3. Speedway Motors Flexplate 168 Tooth Compatible with Chevy Small Block 400 Engine Two Piece Rear Main Seal External Balance Dual Bolt Pattern Non SFI

Speedway Motors Flexplate 168 Tooth Compatible with Chevy Small Block 400 Engine Two Piece Rear Main Seal External Balance Dual Bolt Pattern Non SFI

This flexplate works with Chevy Small Block 400 engines using 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-inch and 11-1/2-inch) fit common automatic transmissions. Replace during installation of new engines or transmissions for reliability. It’s non-SFI rated with a 14-1/4-inch diameter for street use.

Built for standard street-driven applications. Ensures proper starter engagement and smooth operation. Delivers dependable performance in daily-driven vehicles.

Pros	Cons
Fits Chevy 400 engines with two-piece rear main seal. Dual bolt patterns for easy transmission compatibility. External balance ensures smooth starter operation. Built for street use, reliable and durable.	Limited engine compatibility; fits only Chevy small block 400 with two-piece rear main seal. Dual bolt patterns may limit transmission options for non-standard setups. Non-SFI rated; not ideal for high-performance or heavy-duty applications.

Perfect For:

This flexplate is perfect for car enthusiasts who want to upgrade their Chevy small block 400 engine. It’s ideal for standard street-driven applications, ensuring reliable operation with its dual bolt patterns and external balance.

Ready to Purchase?

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4. Automatic Transmission 168 tooth Flexplate+ HP bolts compatible with Chevy 383 400 External Balanced (Flywheel + Bolts)

This flexplate has a 168-tooth ring gear for Chevy 383 and 400 engines. It uses a 2-piece rear main seal design. This part replaces OEM 343738 with a direct fit.

It works with external balanced engines. The kit includes high-performance bolts for strong fastening.

Built to last with strong materials. Installs easily without extra parts. No special tools needed for setup.

Pros	Cons
Perfect fit for Chevy 383/400 engines. Easy installation, direct replacement. Durable construction for lasting performance. Reliable engagement for smooth shifts.	No SFI rating, not for high-performance racing. Two-piece seal may need extra care during install. External balance limits engine compatibility.

Perfect For:

This product is perfect for Chevy 383 or 400 engine builders needing a durable, external balanced flexplate. It’s ideal for those upgrading to a 168-tooth ring gear with a 2-piece rear main seal setup.

Ready to Purchase?

View Price on Amazon (paid link)

5. PRW 1835001 SFI-Rated Internal Balance 168 Teeth Chromoly Steel Flexplate for Chevy 1957-85, 90 Early, V6, Gold Irridate

Unleash the power of your Chevy with the PRW 1835001 Flexplate. This SFI 29.1 certified flexplate is built for racing. It’s tougher and stronger than stock.

This flexplate is 0.035 inches thicker than standard. It’s designed to handle extreme racing conditions.

Get superior performance for your early Chevy V6. This flexplate exceeds OEM standards. Drive with confidence.

Pros	Cons
SFI 29.1 certification ensures race-ready reliability 0.035-inch thickness boosts durability over stock Engineered for high-performance racing demands Exceeds OEM standards for stronger builds Double-welded ring gears handle extreme torque	Not for daily drivers. Requires professional installation. Higher cost than standard parts.

Perfect For:

This flexplate is perfect for racers and high-performance Chevy engine builders needing SFI 29.1 certified strength. Its 0.035 inch thicker design, double-welded ring gears, and racing-focused build exceed OEM specifications, ensuring durability under extreme torque and RPM.

Ready to Purchase?

View Price on Amazon (paid link)

6. 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

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 Speedway Motors SFI Flexplate fits Chevy 350 engines with a 2-piece rear main seal. It’s SFI 29.1 certified for safety and built to handle tough use.

It has a 153-tooth ring gear and a 12.75” diameter for a secure fit. The 2.5” center hole matches Chevy 350 cranks. Works with TH350 transmissions and most torque converters.

The steel plate is 0.035” thicker than stock for extra strength. Zinc plating resists rust. Measures 0.342” from gear to crank face for proper alignment.

Pros	Cons
Fits Chevy 350 engines with 2-piece rear main seal perfectly. SFI certified for safety and strength in high-performance use. Works with TH350 transmissions and torque converters seamlessly. Thicker, zinc-plated steel ensures durability and longevity.	Requires balance plate for 383/400/454 engines (extra cost). Thicker than stock may need minor fitment adjustments. Zinc-plated finish might not suit extreme environments.

Perfect For:

This Speedway Motors SFI Flexplate is perfect for anyone building or upgrading a Chevy 350 engine with a 2-piece rear main seal. It’s built tough with SFI 29.1 certification and heavy-duty steel for TH350 transmissions.

Ready to Purchase?

View Price on Amazon (paid link)

7. Scat FP-400 Flexplate S/B Chevy 168 Tooth External

Unleash the full potential of your engine with the Scat FP-400 Flexplate. This heavy-duty component is built to handle extreme power with ease. It’s the perfect upgrade for any performance build.

Crafted from extra thick material, the FP-400 offers unmatched durability. Its double welded construction ensures it can withstand the toughest conditions. You can trust this flexplate to perform when it matters most.

Get superior performance and lasting reliability. Upgrade to the Scat FP-400 today!

Pros	Cons
Handles extreme power with ease, ensuring reliable performance. Extra thick material provides maximum durability and strength. Double welded for superior strength and longevity. Built tough to withstand high-performance demands.	Added Weight May Reduce Performance Potential for Welding Stress Cracks Limited Compatibility with Non-Chevy Engines

Perfect For:

The Scat FP-400 Flexplate is perfect for high-performance engines. It’s built tough to handle extreme power, making it ideal for racers and enthusiasts.

Ready to Purchase?

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8. SFI Small Block for Chevy 383/400 External Balance Flexplate 168 Tooth Bolts

Get ready for peak engine performance! This SFI Small Block for Chevy flexplate is built for 383/400 external balance engines. It’s a direct replacement that boosts your high-performance efficiency.

This flexplate is engineered for top-notch results. It’s a versatile part that works in many situations.

Need to confirm it’s the right fit? Check your manual or ask a pro. We’re here to help if you’re unsure!

Pros	Cons
Includes 168-tooth flexplate and bolts Engineered for high-performance efficiency Versatile replacement for various applications Easy model compatibility check via Ctrl+F 24-hour customer support for compatibility help	Unclear compatibility without manual model search. Requires manual verification for correct fitment. Limited fitment scope for non-Chevy engines.

Perfect For:

This SFI Small Block Flexplate is perfect for car enthusiasts and mechanics who need a reliable, high-performance part for their Chevy 383/400 engine. It’s easy to install and works great for upgrades or replacements.

Ready to Purchase?

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9. ERSGRP Automatic Transmission Flexplate-Auto Trans Flexplate 1pc for Olds,for GMC,for Chevy,for Cadillac,for Buick FRA-159 10128414

This flexplate fits Buick Roadmaster (1992-1993), Cadillac Brougham (1990-1992), Escalade (1999-2000), and Chevy Astro (1992-1998). Check vehicle compatibility using the top fitment filter. It ensures proper fit for listed models.

The part numbers are 10128414, 14088761, and FRA-159. It meets industry standards for quality and durability. Reliable performance is guaranteed with this flexplate.

This single-piece design offers easy installation. Built for long-lasting use in automatic transmissions.

Pros	Cons
Perfect fit for Buick, Cadillac, Chevy, and GMC models. Reliable performance meets industry quality standards. Easy installation with precise part numbers included. Durable build ensures long-lasting use.	Unclear fitment details may lead to installation confusion. Inconsistent part numbers could cause ordering errors. Lack of quality certifications listed may raise reliability concerns.

Perfect For:

This product is perfect for DIY mechanics or car owners with older Buick, Cadillac, Chevy, or GMC models needing a durable replacement flexplate. It fits vehicles from 1990-2000 and meets industry quality standards for reliable performance.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Choosing the right flexplate is key for your Chevy 383 or 400 engine. It ensures smooth power transfer and engine durability. Get ready to boost your performance!

Here’s what to think about when picking the best flexplate:

SFI Rating: This is super important for racing. An SFI-rated flexplate means it’s tested for safety and strength under high stress. Look for SFI 29.1 certification for top-tier protection.
Engine Balance: Your engine is either externally balanced or internally balanced. Make sure the flexplate matches your engine’s balance. This is crucial for proper operation and to avoid vibrations.
Tooth Count: Most Chevy 383 and 400 engines use a 168-tooth ring gear. This is important for starter engagement. Some smaller engines might use a 153-tooth version, so double-check what fits your setup.
Material and Construction: Chromoly steel is a popular choice for its strength and durability. Look for double-welded teeth and heavy-duty materials. These features ensure the flexplate can handle high horsepower and extreme conditions.
Rear Main Seal: Chevy engines have either a one-piece or two-piece rear main seal. Your flexplate needs to be compatible with your engine’s seal type. This ensures a perfect fit and leak-free performance.
Bolt Pattern: Flexplates often have dual bolt patterns to fit different torque converters. Check the diameter and bolt hole spacing to ensure it matches your transmission and torque converter. This guarantees secure mounting.
Thickness: Some performance flexplates are thicker than stock. This adds extra strength and resilience, especially for high-performance builds. A thicker plate can better withstand engine stress.
Brand Reputation: Stick with trusted brands known for quality performance parts. Companies like PRW, Speedmaster, and Scat offer reliable options. Their proven track record gives you peace of mind.
Warranty: A good warranty shows the manufacturer stands behind their product. Look for flexplates with at least a 12-month limited warranty. This protects your investment and ensures long-term satisfaction.

Ready to upgrade your ride? Let me know if you have more questions!