Small block 4 pulley set fits chevy 283 327 350 383 400 with long water pump sbc. This is a brand new Small Block Chevy Aluminum Pulley Kit. The Water Pump Pulley is. The Crankshaft Pulley is. They are constructed of thick gauge aluminum and with a high quality Black Aluminum finish. This kit also includes a Brand New Black Aluminum power steering pump pulley. This is a single groove pulley. This fits all GM key-way power steering units through 1984 with a 5/8 Shaft. Will NOT fit press-on power steering pumps. Finally this kit also includes the aluminum alternator pulley with aluminum fan. This set is designed for most original GM alternators as well as aftermarket 1 or 3 wire alternators. The pulley diameter is 2 13/16 and comes complete with a dress up nose cover. A nice finishing touch to upgrade an old or new alternator. Groove Water Pump Pulley. Single Groove Aluminum Alternator Pulley With Nut Cover. Aluminum Alternator Fan Blade. Single Groove Saginaw “Key Way” Style Power Steering Pulley. P Professional Installation is Highly Recommended (No Instruction and Wiring Diagram Included).