Fluidampr Pontiac 389 400 421 428 455 CID V-8 Steel Internally Balanced Damper

Protect your engine. Modifications can compromise your stock harmonic balancer. Install a Fluidampr performance damper early for best durability. Superior viscous damper design controls harmful torsional vibration across the entire rpm range. Reduce wear on engine components. Reduce risk of crankshaft failure. Improve timing. Unleash lost torque and horsepower. Precision CNC machined and balanced high-grade steel components. Corrosion resistant black zinc finish with engraved timing marks. No maintenance required. Trusted by leading engine builders worldwide. SFI 18.1 certified. Made in USA. Harmonic Balancer - Fluidampr - Pontiac / Oldsmobile - 1959 - 1979 V8 - Internal Balance - Steel - Black Zinc Chromate - 6-5/8" dia - 10.2 lbs - SFI 18.1 - Made in USA - Each 1959-1979 Pontiac / Oldsmobile. 326, 389, 400, 421, 428, 455 V8. Internal balance. 4 bolt pulley pattern on 3.300 bolt circle. Holes in pulley must be re-drilled, '69-later timing cover and pulley may be required on early models.