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Hays Billet Steel SFI Certified Flywheel - Small and Big Block Chevrolet

1955-1985 Chevrolet Small and Big Block except 400 and 454 with 2-piece rear main seal, 168-tooth, internal balance, 25 lb

PART# 10-125

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Hays steel flywheels are manufactured from certified billet material that will not break up under the stress of high RPM and severe punishment of racing. The 25-pound flywheel fits the SBC, BBC, except for 400 and 454 motors, with 2 piece rear main seal. It has a 168 tooth ring gear. The flywheel is drilled for 11-inch Diaphragm, Borg & Beck, Borg & Beck long, and Mark 12 pressure plates. Internal engine balance and S.F.I. 1.1 certified.


  • Certified S.F.I. 1.1
  • Billet Material
  • 25 lbs.
  • Fits Small and Big Block Chevy Except For 400 And 454 CID
  • 168 Tooth Ring Gear
  • Drilled for 11 inch Diaphragm, Borg & Beck, Long, and Mark 12 pressure plates


# of Teeth168
ApplicationBig Block Chevy
Small Block Chevy
Center Bore (Register Diameter)2.486"
Emission Code5
Engine BalanceInternal
Product TypeFlywheels
SFI Certification1.1
WarrantyLimited 90 Day Warranty
Width0.870 in.
Part Number10-125



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

Drilled for 11 inch Diaphragm, Borg & Beck, Long, and Mark 12 pressure plates.

Warranty Information

Limited 90 Day Warranty: See Details
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