Milodon Performance Aluminum High Volume Water Pump for Pontiac has a standard rotation and is made from aluminum, a high volume model for 350, 400, 455 engines. Fits 350 engine 1969-77, 400 engine 1969-77 and 455 engine 1970-76. Uses a 5/8 inch shaft pilot and has a 4 1/2 inch hub height.