Short Cast Aluminum Water Pump High Volume for BBC Chevy 396 427 454 Fits big block Chevrolet ,Suitable for all street or racing applications. Welded 1 3/4" inlet port for lower hose. Natural finish. Billet body and impeller provide tight clearances for excellent flow characteristics. Impellers are machined to maximize volume and pressure. Pump will clear cam belt drives and most blower drives. Standard rotation,Includes gaskets. Custom impeller povides 30% more flow than stock pumps.