Underdrive Pulley Kit for Ford 289 & 302 - V-Belt Made in the USA from 6061-T6 Billet Aluminum Underdrive Ratio Increases Horsepower by 10 - 20 HP Requires 3 Bolt Dampener and Passenger Side Lower Radiator Hose Ford Passenger cars 1965 - 1969 & Ford Trucks 1965 - 1977 Billet Aluminum Pulley Kit for Small Block Ford (3 Bolt Crank) Ford Small Block V Belt Pulley kit for 289, 302, 351C or 351W engines. This kit will for result in underdrive pulley ratio of 88%. Designed for use with stock alternator and power steering brackets. Application 1) Ford Passenger cars 1965 - 1969. 2) Ford Trucks 1965 - 1977 Fits vehicles with: 1) Factory 3 bolt fluid dampener 2) Passenger side lower radiator hose. 3) Dampener face to water pump flange face 3 7/8" Ford Pulley Kit Contents: Water Pump Pulley P/N SBFE1WP Grooves: 1 Pulley Diameter: 6.2" Pilot Diameter: 0.625" Crankshaft Pulley: P/N SBFE1CR Grooves: 1 Crank Pulley Diameter: 5.4" Crank Pulley Bolt Pattern: 3 Bolt Alternator Pulley: P/N SBF1ALT Diameter: 2.7" Alternator Shaft Diameter: 11/16"