SFI 18.1 Harmonic Damper for GM 98-02 LS1 F-Body & 04-06 LS1/LS2 GTO – w/ Crank Bolt. Features 8 Rib drive & 10% Overdrive. Complete F-body and GTO Conversion Kits also available, see options below. This damper comes standard with...

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...

SFI 18.1 Harmonic Damper for GM 98-02 LS1 F-Body & 04-06 LS1/LS2 GTO – w/ Crank Bolt. Features 6 Rib drive & 10% underdrive diameter pulley. Underdrive dampers are for use on Naturally Aspirated engines making 700hp or less. For engines...

SFI 18.1 Harmonic Damper for GM 98-02 LS1 F-Body & 04-06 LS1/LS2 GTO – w/ Crank Bolt. Features 6 Rib drive & std. diameter pulley. This damper comes standard with 3/16″ Keyway for use with aftermarket crankshafts.. NOTE: Innovators...