These "super cooling" pumps are computer-designed to deliver more flow at a higher velocity. They're the ideal choice to prevent overheating in any street machine, street rod, truck, or any performance vehicle. Precision cast powdered metal impellers have extra large vanes for the maximum flow rate possible, ensuring adequate pressure and volume even at lower engine speeds. Standard and reverse rotation pumps are available for most Chevrolets, Fords, and Chryslers.For 1965-68 289, 1968-69 302, 1969 351-W (5/8" pilot shaft)* Right-hand inlet with back plate. Dimension from casting to hub: 5.42". Inlet diameter: 1.78".