S&S Cycle 124" Big Bore Cylinder Kit - Stone Gray - Twin CamFeatures Big Bore kit yields excellent results with stock cylinder heads Easy installation no need to bore or split existing cases, just swap the cylinders (unless otherwise noted) Cylinders are constructed from premium aluminum castings with cast in iron liners Kit includes cylinders, pistons, rings and gaskets (head, base and exhaust) Made in the USA Project requires a skilled technician. It is the responsibility of the person assembling the parts