Small Ford Crankshaft Pulley, 289, 302, 351W, 351C V-Belt Ford Small Block V-Belt Crankshaft Pulley - 3 Grooves for 302, 351W and 351C engines Made in the USA from 6061-T6 Billet Aluminum Underdrive Ratio Increases Horsepower by 10 - 20 HP Requires passenger side lower radiator hose and 4 bolt crankshaft Designed for late model engine transplanted into older vehicles