How to find the right Automotive Performance Flexplates AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Automotive Performance Flexplates
- SFI certification
- Use an SFI 29.1 flexplate for high-power or race cars and where sanctioning bodies require it Stock stamped flexplates crack around the crank hub under high power and stall-converter loads.
- Engine balance
- Match internal versus external balance and the correct counterweight for your engine and crank A wrong-balance flexplate causes severe vibration and bearing damage.
- Ring gear tooth count
- Match the tooth count to the starter and bellhousing (for example 153 vs 168 on some GM engines) Wrong tooth count means the starter will not engage or the plate will not clear.
- Converter bolt pattern
- Confirm the flexplate's converter bolt circle matches your torque converter Some converters for the same transmission use different bolt circles.
- Crank bolt pattern and spacer
- Match the crank flange pattern and confirm whether a spacer is needed Without a spacer the converter can bottom out against the pump.
Brands that matter
- TCI: SFI flexplates for many domestic applications.
- B&M: Flexplates sold with its converters and transmissions.
- Hays: SFI flexplates in many balance and tooth configurations.
- ATI: Race-oriented flexplates.
What to avoid
- Reusing an old flexplate with a new high-stall converter
- Guessing balance on a rebuilt engine instead of confirming it
- Skipping thread locker or the correct crank bolts
Questions
How do I know whether my engine is internally or externally balanced?
It depends on the specific crank and engine; check the engine builder's records or the factory spec rather than relying on what came off the car.