Hays 10-010 Steel SFI Certified Flexplate - Small and Big Block Chevrolet

1957-1985 Small Block and 1965-1970 396-427 Big Block Chevrolet, 168-Tooth, Internal Balanced, dual torque converter bolt pattern.

PART# 10-010

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Hays heavy duty Flexplate for high performance competition Chevy engines are constructed of a thicker than stock steel plate. This enables them to withstand the stress of high-stall torque converters and high-RPM engines. These flexplates are supplied with a ring gear that is securely welded in place and feature a dual bolt pattern for use with a Powerglide or Turbo style torque converter. This flexplate has a 168 tooth ring gear and fits the internal balance Chevy V8 engines. It is S.F.I. 29.1 certified and zinc dichromate plated to resist corrosion.


  • S.F.I. 29.1 Certified
  • Internal Balance for 396, 402, and 427 Engines
  • 168 Tooth Ring Gear
  • Zinc Dichromate Plated
  • Heavy Duty design is 0.030" thicker than stock flexplate

Product Attributes

Emission Code5
Product TypeFlexplates
Part Number10-010



This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Tech Resources

This is for 396, 402, and 427 big block engines. 454 and larger big blocks were externally balanced from the factory.


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