GP Series Piston KitEndurance and high rpmEach piston is electra-coated on the dome, ring groove, and pin bore, for maximum wear resistance and protection from micro-welding, galling and detonationGP Series parts generally have less machining on the outside, which helps seal up the bore for increased compressionArmorGlide® skirt coating reduces friction and noise for more horsepower potentialKit includes piston, ring(s), wrist pin and circlipsEngineered, forged, and machined in the USADoes not have an intake window. Pinned on centerline. Fits Nikasil bore cylinder and SCEM (Suzuki Composite Electrochemical Material) cylinder. Sleeving or replating is required.