CHEVROLET Chevy big block Mark IV Crankshafts

Gen. 4 BB Chevy Forged Steel Crank, 4.250 stroke, Two Piece Rear Seal, Req's Narrowed Rod Bearings, Lightened holes, Nitride, 6.385 in. Rod

Part Number: SUM-BBC425063851

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Crankshaft Key, Short, 2 Degree Offset, Chevy, Ford, Pontiac, Chrysler, Each

Part Number: MRG-987G

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Crankshaft Key, Long, Chevy, Chrysler, Dodge, Plymouth, Each

Part Number: MRG-983G

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