CVF Racing V-Belt Pulley Kit for Ford Big Block. This Kit provides 95% underdrive ratio and is designed for use with stock power steering and alternator brackets. Intended for vehicles with power steering and alternator. Fits vehicles with factory 4 bolt fluid dampener and 1970 or newer water pump. Dampener face to water pump flange face 3 1/16" Ford Pulley Kit Contents: Water Pump Pulley P/N BBFL1WP Grooves: 1 Pulley Diameter: 6.0" Pilot Diameter: 0.625" Crankshaft Pulley: P/N BBFL2CR Grooves: 2 Crank Pulley Diameter: 5.4" Crank Pulley Bolt Pattern: 4 Bolt Alternator Pulley: P/N BBFL1ALT Diameter: 2.7" Alternator Shaft Diameter: 11/16"