Small Block Chevy Black Aluminum 3 Pulley Set 2 3 Groove Long Pump SBC 350 400. This pulley kit works on all Small Block Chevy 283 327 350 400 engines with a “LONG” water pump. This is a brand new Small Block Chevy Aluminum Pulley Kit. The Water Pump Pulley is Double Groove and comes with water pump pulley bolts. The Crankshaft Pulley is Triple Groove. They are constructed of thick gauge aluminum and with a high quality Satin Aluminum finish. 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. 5- Double Groove Water Pump Pulley (with bolts). Triple Groove Crank Pulley. Single Groove Aluminum Alternator Pulley With Nut Cover. Aluminum Alternator Fan Blade. P Professional Installation is Highly Recommended (No Instruction and Wiring Diagram Included).