Polished Aluminum High Volume Long Water Pump For Big Block Chevy BBC Fits big block Chevrolet ,Suitable for all street or racing applications. Maded in heavy duty ultra-light weight aluminum,Polished finish Welded 1 3/4" inlet port for lower hose. 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.