Pair up a new set of pulleys sure to match for your Small Block Fits Chevy equipped with a long-style water pump. These convienent combos feature a chrome plated finish, for use on 1969-1985 SBC engines. Chrome plated finish. Lightweight and strong. For 283-350 Fits V8 Small Block Fits Chevy long style water pumps. Double groove water pump pulley for 2 V-belts. Triple groove crankshaft pulley for 3 V-belts. Kit Includes: (1) SBC Chrome Long Water Pump Pulley - Double Groove. (1) SBC Chrome Long Pump Crank Pulley - Triple Groove. SBC Chrome Long Water Pump Pulley - Double Groove Diameter is 6-1/4" Mounted Length: 2.58" Shaft Diameter: .64" Bolt Hole Pattern: 4 on 2.15" Belt Width: .40" SBC Chrome Long Pump Crank Pulley - Triple Groove 7-3/4" Outside Diameter. Mounted Length: 2.70" Bolt Hole Pattern: 3 on 2.75" Belt Width: .40" Inside Diameter: 1.12" Notes: It may be necessary to shim either or both of the pulleys to achieve perfect belt alignment. There are variances between manufacturers of both water pumps and pulleys. Water Pump Pulley: Mounted length is from the face of the water pump pulley mount towards the front of the engine. Crank Pulley: Mounted length is from the face of the harmonic balancer towards the front of the vehicle. Get the correct pulleys for your application by learning which water pump you have as explained in our tech article. SBC - Short vs Long Water Pump.