The KB PERFORMANCE Performance Piston Assembly is a complete top‑end kit engineered for the 103 cu in. Twin Cam platform. Each piston is forged from a hypereutectic alloy and features a flat‑top crown that, together with a 3.875 in. bore (oversized +0.005 in.) and a 4.375 in. stroke, delivers a 10.0:1 compression ratio. The kit is sized for a 103 cu in. displacement engine, providing the dimensional precision required for reliable street‑focused performance.
The kit supplies all essential components for a full rebuild: two hypereutectic pistons, two matching wrist pins, four spiral lock‑pin clips, and two moly‑coated ring sets. Designed for street riding, the moly‑coated rings offer reduced friction and improved wear resistance, while the oversize bore tolerance ensures a proper seal and consistent compression throughout the engine’s service life.