106-3964A 124" 4-1/8" bore forged piston kit. +.020"

This S&S forged piston kit is designed as a replacement for 124-inch Super Sidewinder Plus engines featuring a 4-1/8 inch bore. These pistons are engineered for performance applications in both Evolution and Twin Cam based S&S engine platforms. The forged construction provides the structural integrity required for large-displacement V-twin builds. This specific kit is sized at +.020 inches over standard to accommodate cylinder boring during a rebuild. Each kit is sold as a complete set and includes the pistons, wrist pins, wrist pin clips, and a matching set of piston rings. S&S Cycle components are manufactured to exacting tolerances, making them the preferred choice for maintaining or refreshing high-output American V-twin powerplants.