Billet Aluminum Big Block Ford Water Pump Pulley (V-Belt) 2 Groove Water Pump Pulley for Ford Big Block 429 & 460 ("385" series) Engines. Pulley provides 95% underdrive ratio when used with CVF Racing crankshaft pulley. Designed for use with stock power steering and alternator brackets. Application 1) Ford Big Block "385" series engines Fits vehicles with: 1) Factory 4 bolt dampener required. 2) 1970 or newer water pump is required 3) Dampener face to water pump flange face 3 1/16"