Manufactured by SPI Pistons are for standard bore size 73.80mm SPI pistons are engineered to provide the best possible path for combustion chamber heat transfer to the cylinder walls All pistons, rings, pins and circlips are manufactured to OEM specifications All individual components are interchangeable with original parts Piston weight compatible with original piston Contains all gaskets pictured to rebuild top end (oil seals not included) Made in Taiwan T-Moly series pistons additional benefits Machined smooth heads MOS2 (Teflon-molybdenum coating) Hard anodized crowns Hypereutectic cast