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Product Summary

Chevy Small Block V8, 12.81" Outside Diameter, Steel

  • Perfect for installing new engine or transmission
  • Intended for two-piece rear main seal engines ONLY
  • Dual bolt patterns, 9-3/4" and 10-3/4"
  • Flexplate O.D. 12-3/4"
  • Center Hole 2-1/2"

Key Specs

MFG. Part #577FRA112
Outside Diameter12.81"
Tooth Count153
Torque Converter Bolt Circle10.75 and 9.75
Hole Diameter2.50"

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Details

These non-SFI rated S/B Chevy automatic transmission flexplates are suggested whenever installing a new engine or transmission. These flexplates are for two-piece rear main seal engines ONLY.

  • (Internal balance, 153-tooth)
    • Dual bolt patterns, 9-3/4" and 10-3/4"
    • Flexplate O.D. 12-3/4"
    • Center Hole 2-1/2"

Make sure you choose the correct flywheel for your application by reading our tech article. Small Block Chevy - How to Choose a Flexplate.

Specifications

KEY SPECS
MFG. Part #577FRA112
BrandSpeedway Motors
Outside Diameter12.81"
Tooth Count153
Torque Converter Bolt Circle10.75 and 9.75
Hole Diameter2.50"
GENERAL
SFI RatingNot SFI-approved
Weight4.45 lbs.
Material TypeSteel
FinishNatural
Sold in QuantityEach
NotesInternally balanced flexplate for two-piece rear main seal engines. Will not accept balance plate PN# 91615375