This is a new genuine OEM piston ring set for Ford 289, 302, and 351 V8 engines. It includes two sets of piston rings and weighs 11oz. The item is made in the United States and has the part number C3AZ-6148-F. It is compatible with interchange and OE/OEM part numbers C3AZ6148F and has superseded part number C3AZ-6148-F. This set is perfect for those looking to replace their old piston rings.