98-02 F-body, 04-06 GTO Underdrive Crank Balancer Pulley

Fluid Dampened Balancer These dampers are made with an internal steel inertia ring that is surrounded by a high viscosity silicone gel. The internal inertia ring "floats" in the silicone gel to combat the engine harmonics at all RPM ranges. External balance applications feature a removable hub, in order to accurately blueprint the engine and balance the assembly. Exceeds SFI 18.1 specification Easy to read laser engraved timing marks Accurate crank bore for a proper pressed fit Manufactured from high grade billet carbon steel forgings