1654-M30 1997-2016 Ford Truck Lincoln Mercury 4.6L 5.4L water pumpWe designed a impeller for pump 1654 that fits the Ford and Lincoln Trucks 281 4. 6L and 330 5. 4L with a 30MM (~1. 1") threaded hub. It has an increased vane count and a reduced impeller vane clearance to reduce engine temperatures. 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