SFI-Rated FluidGel Harmonic Damper - Ford 332-428FE , 429-460 BB 1958-97, 4-Bolt Pulley, 7.25 OD, Black Anodized, Internal Balance.
These dampers are made with an internal steel inertia ring that is surrounded by a high viscosity silicone gel. The inertia ringfloats in the silicone get 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. These products are available in black epozy or polished steel with an epozy clear coat.