S&S Cycle SS91-7661 96ci Sidewinder Big Bore Stroker Kit Black for Big Twin 84-99An S&S 96" 3 5 8" Sidewinder big bore stroker kit is an economical route to a larger displacement engine. This kit contains nearly everying needed to take a stock 80" Harley Davidson Evolution big twin engine up to 96" displacement. This kit includes S&S 3 5 8" bore aluminum Sidewinder cylinders and forged pistons, a 4 5 8" stroke dynamically balanced S&S flywheel assembly, complete with S&S heavy duty connecting rods and mainshafts, head gaskets,