1880 1971-1990 Chevy GMC 1971-1982 Corvette Short 3/4" shaft for 305 350 374 water pumpFlowkooler's pump 1880 for a small blocks with the short height and the 3 4" pilot shaft has a 16 blade skip vane impeller that is CNC machined from billet aluminum. An increased vane count and a reduction in the plate impeller clearance achieves greater flow rates, higher head pressure and a more efficient flow than other OEM water pumps. It is then surface coated with a military grade type II Class II anodized finish. FlowKooler introduced the first