This is a mechanical water pump for big block Chevrolet. It is set up for serpentine style belt, reverse rotation. The 400 Series belt driven pumps are show quality outside and race bred inside. They are available for big and small block Chevy (standard and reverse rotation) and small block Ford. These pumps are all billet construction. The appearance and unmatched low speed flow numbers make them popular with the street rod crowd. The high RPM performance is capable of cooling any race engine.