S&S Cycle 70-84 BT 103in Sidewinder Big Bore Stroker Kit - Gloss Black

Starting with a 5-inch stroke small diameter dynamically balanced S&S flywheel assembly, this kit is designed to economically increase the displacement of your stock 74 or 80 cubic inch Harley-Davidson Shovelhead engine to a robust 103 cubic inches. The Sidewinder® cylinders feature a 3-5/8 inch bore and are constructed from high tensile cast iron, offering a solid foundation for increased performance. This stroker kit includes forged pistons, complete with wristpins and rings, ready to be installed.

This kit is a comprehensive solution for those looking to significantly upgrade their engine's power and torque. The combination of the larger bore and extended stroke from the flywheel assembly fundamentally changes the engine's breathing and combustion characteristics, leading to a noticeable improvement in acceleration and overall power output. The gloss black finish on the cylinders adds a custom aesthetic to your engine build.

When undertaking this kind of engine modification, it's important to ensure all supporting components are in good condition. While this kit contains the core components for the big bore stroker conversion, you may want to inspect other engine parts like the camshaft, oil pump, and ignition system to ensure they can handle the increased demands of the larger displacement engine. Always refer to the manufacturer's installation instructions for detailed guidance.