HP Aluminum Water Pump 55-95 SBC 3/4 Pilot Hub

The HP Aluminum Water Pump 55-95 SBC 3/4 Pilot Hub is a high-performance mechanical cooling system component engineered for small block Chevy engines demanding reliable circulation under sustained load. Built by PRW Industries—a manufacturer with deep roots in performance engine development—this pump delivers dependable coolant flow for street, race, and work applications where factory cooling falls short. The 3/4-inch pilot hub design ensures precise fitment and alignment on compatible engine blocks, eliminating leak points and maximizing seal integrity.

Constructed from lightweight aluminum, the pump reduces rotating mass compared to cast-iron alternatives, lowering parasitic drag on the crankshaft and freeing horsepower for the wheels. The revised impeller entry geometry optimizes coolant velocity and turbulence patterns, improving heat transfer efficiency across the cylinder head and block during high-RPM operation. The compact short-design housing fits tight engine bays without requiring extensive modification, while the 3/4-inch pilot diameter provides a secure, zero-slop connection to the water pump shaft. This mechanical pump operates without electronic controls, offering simplicity and reliability in environments where electrical systems face stress or vibration.

Engine builders, restoration specialists, and weekend racers restoring or upgrading carbureted and early fuel-injected small block Chevys will find this pump essential for systems running higher coolant volumes or tighter timing curves. The natural aluminum finish resists corrosion in typical cooling loops while maintaining a clean engine-bay aesthetic. Installation requires standard mechanical pulley setup and serpentine or V-belt drive; verify your specific engine year and accessory configuration before ordering to ensure proper fit and belt alignment with existing brackets.