Stewart Stage 3 Aluminum Water Pump Short 5/8 Shaft

These pumps are assembled with 356-T6 heat treated aluminum castings. Precision CNC machined components. The fan hubs are 1/2″ thick and machined from billet steel. These pumps are preferred by many top engine builders for higher RPM applications.

These stage 3 water pumps feature 1/2″ thick steel fan hub with a set screw for positive retention at 5.625″ (5-5/8″) block to hub distance and a 356-T6 heat treated aluminum casting. The S/B Chevy pump has an extra rigid cam stop with a 3/8″ adjusting screw. The extra material adjacent to the block mounting bolts allows drilling and tapping up to 1/2″ NPT holes for external cooling lines on S/B Chevy. There is higher flow and pressure for better cooling as well as equal flow to right and left cylinder heads. The 3/4″ bearings offer 5 times the strength of standard bearings. Precision impeller installed to exacting tolerances.  Pump features 0.525″ drilled mounting bolt holes to allow for up to 0.15″ for adjustability to tighten pulley belt/s.  One year manufacturers warranty.