12670965 This Forged Steel Crankshaft Is Used On All 2Nd Design Zz4 350 Engines Afternovember 1998 And Can Be Used To Replace All Cast Or Steel Forged Crankshaftson Zz4 Engines Only. Replaces 12556307
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Technical Note: This crankshaft is made of 1053 steel and balanced to connecting rod P/N 10108688 and piston P/N 10159436. This crankshaft cannot be used on earlier ZZ design engines because the pistons change engine balance.
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