Stewart Stage 1 pumps use brand new, original equipment castings that are machined to our exacting standards. Stage 1 pumps are compatible with stock lines and brackets but are internally modified for performance and reliability! Recommended for stock, OEM, or mild performance applications.
Stewart Stage 2 water pumps are assembled using the exclusive 356-T6 heat – treated aluminum casting. These pumps include several significant performance modifications, compared to Stage 1 pumps, for maximum performance. Recommended for stock, OEM, or mild-moderate racing applications.
Stewart Stage 3 water pumps are assembled using the exclusive Stewart 356-T6 heat – treated aluminum casting. These pumps feature a 1/2″ billet steel fan hub that is strongly recommended for high RPM applications. Recommended for any racing application.
Stewart Stage 4 pumps are the cutting edge in performance water pump technology. The Stage 4 pump utilizes the Stewart Components DRV-8 impeller. This exclusive 8 vane impeller is fully CNC machined from 6061-T6 billet aluminum. It’s special design flows up to 160 GPM, while consuming less than 3 horsepower at 4,500 pump RPM. Stewart Stage 4 pumps are the ULTIMATE water pump for any application!