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: 12561217
Year Of Engine: 1991-up
Outside Diameter: 14"
Crank Flange Bolt Pattern: 3.580"
Converter Bolt Pattern: 11.5"
Starter Ring Gear Teeth: 168
Technical Notes: 427 crate engine production internally balanced .100" thick