This CP piston and ring single is built for the Acura B18C1 application with an 81.5 mm bore, +0.5 mm oversize, X-forgings and a 12.5:1 compression ratio. Supplied as a single piston with rings, it is sized and forged for high-strength service in the specified B18C1 engine configuration and lists the bore and compression specification for accurate assembly and rebuild work.
CP Piston & Ring Single w/ X-Forgings for Acura B18C1 - Bore (81.5mm) - Size (+0.5mm) - CR (12.5:1)