Engine Harmonic BalancerFluidamprFluidampr Performance DamperHarmonic BalancerHarmonic Balancer - Fluidampr - Ford Small Block - EachHarmonic Balancer - Fluidampr - Internal Balance - Steel - Black Zinc - SFI 18.1 - 6-5/8 in O.D. - Ford Small Block - Eachharmonic, Balancer, balancer, fluidamprInternally balanced Ford 302 / 351 engines.Protect your engine. A Fluidampr performance damper provides premium, broad range control of destructive crankshaft torsional vibration for optimum performance and durability. Designed for custom built, internally balanced Ford 302 / 351 engines. Features 3-bolt SVO pulley pattern. High quality, long lasting viscous silicone damper technology with precision CNC machined and computer balanced high-grade steel components. No tuning or maintenance required. SFI 18.1 approved, race proven for over 25 years. Made in the USA.