1690 1950-1955 Chevy 235 Inline 6 water pump 4" tall with 3/8" groove pulleyFlowkooler designed a high flow water pump with a CNC machined billet impeller with increased vane count and a reduced casting to impeller vane clearance. It achieves greater flow rates, higher head pressure and a more efficient flow. The impeller color is due to Type II Class II military grade surface coating which protects against corrosive fluids. FlowKooler introduced the first hi flow pumps for the inline 6 and continues to improve impeller