ATI crankshaft step keys are designed for reducing cranks with a 1/4 in. keyway to 3/16 in.

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MANLEY Crankshaft, 2-Piece Seal, Internal Balance, Forged 4340 Steel, 4.750 in. Stroke, BBC 454, Each

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SCAT Crankshaft, 2-Piece Seal, External Balance, Forged 4340 Steel, 3.763 in. Stroke, For Chrysler, 440, Each

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