Small Block Chevy Black Aluminum 3 Pulley Set 1 2 Groove Long Pump 283 350 400. Small Block Chevy Water, Crank, Alternator Pulleys Set. 283 – 305 – 307 – 327 – 350 – 400. Black powder coated Aluminum. Use with Long Water Pump. 5- 1 groove water pump pulley. 2 groove crank pulley. B 1 groove keyway style power steering pulley. P Professional Installation is Highly Recommended (No Instruction and Wiring Diagram Included).