Crankshaft pulley for 1970-77 Cutlass, 442, 88 and 98 models with Oldsmobile V8 engines (except cars with air conditioning, heavy duty cooling, or A.I.R. system); and 1971-78 Toronado except cars with air conditioning, heavy duty cooling or A.I.R. system. Two groove pulley measures 6 1/4" outside diameter.