FLYWHEELS AND FLEXPLATES
Chevrolet Performance offers both internally and externally balanced flywheels and flexplates. It is critical that you use the correct design for your specific engine application. Engines with one-piece crankshaft seals require externally balanced flywheels or flexplates (except for ZZ427, ZZ572/620, ZZ572/720R and the Anniversary Edition 427).
Part Number: 3991469
Year Of Engine: 1965-present(Big-block) 1955-1985(Small-Block)
Outside Diameter: 14
Crank Flange Bolt Pattern: 3.580"
Clutch Diameter: 10.400" & 11.000"
Starter Ring Gear Teeth: 168
Technical Notes: Use with internally balanced engines - For 2-piece crank seal