Chevrolet Performance Crankshafts are Forged Steel (used in late-style ZZ4, ZZ5, and ZZ6 engines).
Forged 1053 steel crankshaft used in post-November 1998 ZZ4 engines
Replaces all cast or steel ZZ4 crankshafts
NOTE: Must be used with connecting rod P/N 10108688 and piston P/N 10159436