SFI 18.1 Harmonic Damper for GM 98-02 LS1 F-Body & 04-06 LS1/LS2 GTO - w/ Crank Bolt. Features 8 Rib drive & Std. Dia.
This damper comes standard with 3/16" Keyway for use with aftermarket crankshafts.
NOTE: Although this damper is designed with 8 belt grooves, it may be used with the stock 6-rib accessory drive with no issues.