This is an Original GM Power Steering Pump and Pulley for Oldsmobiles, Cutlass, Cutlass Supreme, 442, F85, Delta 88, 98 With Small Block V8, Without Air Conditioning or Heavy Duty Cooling. The Pump is a Core Pump (It has Not been tested), the Pulley is 5 3/4" in Diameter, Single Groove, with a stamp of "KG". The Pump and Pulley were removed from a 1971 Cutlass, and the Pump was full of fluid. See Pictures