Nicely chromed High Volume Short Water Pump for SBC Chevy 283 327 350 Fits for Small Block Chevy cars This is a mechanical water pump with a 5/8" pilot.3/4" NPT top port.1/2" NPT side port. Billet body and impeller provide tight clearances for excellent flow characteristics. Pump will clear cam belt drives and most blower drives. Standard rotation,Includes gaskets.