Stage 4 Aluminum Water Pump
The Stage 4 Pumps incorporate the all new DRV-series 8 vane CNC machined 6061-T6 billet aluminum impellers. Developed by Stewart Components, these impellers flow up to 41% more water at twice the pressure than traditional designs... while consuming less horsepower.
These are premium water pumps and carry the following features:
Models with 3/4" ball/roller bearings offer five times the strength of standard bearings
Equal flow to left and right cylinder heads
High flow and pressure
356-T6 heat treated aluminum specially ribbed casting
Maximum flow close tolerance DRV-8 aluminum impeller
Zinc-plated rear cover and bolts
Extra rigid cam stop with 3/8" adjustment screw for small block models
Two 1/2" NPT auxiliary inlets
Extra material on small block Chevrolet models for installing external lines to center of the cylinder heads
More flow than any pump available
More pressure than competing pumps
Less horsepower consumption
Precision ground ½” steel billet fan hub with dual bolt pattern for perfect pulley alignment
Fan hub set screw for positive positioning
Chevrolet Small Block - Short
1955-68 Passenger Cars
1955-72 Light Trucks
5.625" Length
3/4" Bearing
3/4" Shaft
Special Severe Duty Pump
High Flow Pump
Cast Aluminum Finish
