Crankshaft – Forged 1053 Steel


  • Forged 1053 steel
  • Used in post-November 1998 ZZ4 engines
  • Replaces all cast or steel ZZ4 crankshafts

Shipping is free, but there is a delivery fee for residential addresses.


P/N 12670965

  • Forged 1053 steel crankshaft
  • Used in Performance “604” engines
  • Replaces all cast or steel ZZ4 crankshafts

Note: Must be used with connecting rod P/N 10108688 and piston P/N 10159436.


Forged Steel Crankshaft

12670965 Chevrolet Crankshaft

For ZZ4 Engines

A crankshaft is that massive piece of convoluted steel that holds the whole engine together. An engine is essentially a pump, and without a strong crankshaft, the pump won’t work. GM puts the same top-quality engineering and manufacturing processes into its crankshafts as it does all its parts. These crankshafts are the same ones used in Chevrolet Performance crate engines. The crankshafts are available in cast iron and forged steel. Forged crankshafts should be used for higher-horsepower applications.

Prop65WARNING: These auto parts can expose you to chemicals including phthalates and lead. Installing or using these parts can expose you to other parts containing these chemicals and to engine exhaust, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to