Billet Aluminum Big Block Ford Alternator Pulley and Cap - V-Belt Ford Big Block 429 & 460 (385 series) Engines. Application Ford Big Block 385 series engines 1968 - 1987 Ford Passenger Cars and Trucks Fits vehicles with: Factory 4 bolt dampener required. 1970 or newer water pump is required Dampener face to water pump flange face 3 1/16 Diameter: 2.7 Overall Length: 1.9 (Including Cap) Grooves: 1 Shaft Diameter: 0.67 QUESTIONS? CLICK HERE TO VIEW OUR FORD BIG BLOCK SELECTION GUIDE