Sidewinder Big Bore Stroker Kit, Contains nearly everything needed to take a stock 74" or 80" H-D. Shovelhead engine up to 93" or 96" displacement, Includes 3.625" bore high tensile, cast iron sidewinder cylinders and forged pistons with wrist pin and rings, a 4.5" or 4.625" stroke, dynamically balanced S&S flywheel assembly complete with S&S heavy duty connecting rods and mainshafts, S&S stainless steel head bolts, base nut, S&S adjustable chromoly steel pushrods, head gaskets, base gaskets, exhaust gaskets, and an S&S heavy-duty top motor mount, Made in the U.S.A.