Crankshaft Rebuilders remanufactures the highest quality GM engines built for Pontiac, crankshafts available. All Crankshaft Rebuilders Pontiac Crankshafts are remanufactured in the USA by quality technicians with years of experience. This crankshaft kit is for th GM 350 and 400 Pontiac engines. It fits years 1976-1979 with forging # 496452 and having 2 1/2 inch centering ring for flywheel.