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The ATI 8.074-inch steel crankshaft damper for Chevy big-block engines includes a second 1/4-inch keyway and a three-ring one-piece construction. The larger diameter gives increased inertia for better vibration control, while the additional key location supports accessory or blower drive requirements common in modified big-block installations.
ATI Damper - 8.074in - Steel - Chevy BB - w/2nd 1/4 Key - 3 Ring - 1Pc
