Wiseco Performance Oversized Piston Kit (Part #40060M06600) for 1968-73 Honda CB350/CL350 motorcycles. This complete kit includes a forged piston, high-performance ring set, and alloy pin—everything needed for a successful rebuild. Precision-forged from aerospace-grade alloy for superior strength and durability. Features horizontal slot-pin oiling to reduce friction and scuff resistance, plus a pressure-seal groove for optimal ring sealing. Fits 66mm bore applications with 10.5:1 compression ratio. Made in the USA and trusted by professional race teams.