ATI Serpentine SFI 18.1 Super Damper - 7.480 in OD - AC Pulley - Black - Internal Balance - GM LS-Series DX2K Allows you to change the

Allows you to change the amount of ignition vacuum advance for maximum part-throttle performance while preventing the harmful effects of spark knock (detonation)

With 3/8-24 fluid outlet port located at the top radius of the cylinder bore

1960-1974 Chevrolet K20 Pickup

Do NOT use solvents

ATI Serpentine SFI 18.1 Super Damper - 7.480 in OD - AC Pulley - Black - Internal Balance - GM LS-Series DX2K Allows you to change theThe patented ATI Super Damper is the only crankshaft damper designed exclusively for high performance Chevy engines. ATI Performance Products is a company founded on innovation, precision and service. ATI harmonic Super Dampers add horsepower and torque to race, street and truck engines. ATI Performance Products is the creation of over 40 years of Transmission and performance component manufacturing and racing experience. Product Description: Harmonic