S&S Cycle Forged Stock Bore Stroker Piston Kit For Harley Big Twin Building or refreshing a stock bore stroker engine The S&S Cycle Forged Stroker Piston Kit is designed for 84, 86, and 88 applications using stock-diameter flywheels. Combining forged construction with modern alloys and advanced skirt profiles, it helps provide low-noise operation and extended service life. Features: Forged stock bore stroker piston which replaces several cast and forged piston series that S&S Cycle previously offered The new piston can be used in 84, 86 and 88 stock bore stroker engines with stock diameter flywheels The modern alloys used in the piston, coupled with the advanced skirt profiles, result in low engine noise and long engine life that could only be achieved with cast pistons in the past