Big bore and stroker piston kit. Panhead, Shovelhead 88ci-98ci 3.625 inch 8.5 to 1 dome top piston (4.25 inch -4.75 inch stroke,+.030 bore. Each set of pistons includes wrist pins, spiral locks, engine assembly lube, and Hastings Moly rings. All wrist pins are .792 inch O.D. Sold in pairs. Manufacturer