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The Stage 3 has been Stewart’s most popular pump for over 10 years. It offers equal flow to left and right cylinder heads. Made of 356-T6 heat treated aluminum with a specially ribbed casting. Pump features zinc-plated rear cover and bolts, precision ground ½" steel billet fan hub with dual bolt pattern for perfect pulley alignment and a fan hub set screw for positive positioning. 3/4" shaft with two -4 ORB fitting at the top and one -8 ORB on the bottom. Two 1/2" NPT auxillary inlets on the side. SBC.