piston88In most engine arrangements, including steam-powered engines, large stationary andor marine engines, this pin is located in a sliding crosshead that usually connects to the piston via a rod.. This pin is a forged small hollowB20 84.5mm Oversize Hh Compression Pistons and Hastings Racing Rings Genuine YCP Pistons 84.5mm Oversize This Kit Contains:YCP 84.5mm Bore Oversize Hh Compression