Milodon Performance Steel High Volume Water Pump for Big Block Chevy has a standard rotation and is made from steel, a high volume model for 396, 402, 427, 454 engines. Fits Camaro 1969-70, Chevelle 1970-73, El Camino 1969-75, Impala 1971-76, Nova 1969, Blazer 1976-78, Truck 1/2 ton 1973-79, Truck 3/4 ton 1973-86. Uses a 5/8 inch shaft pilot, 1 7/8 inch inlet and has a 7 5/16 inch hub height.