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Upgrade your Twin Cam engine with the S&S Cycle 124" Hot Set Up® Big Bore and Stroker Kit, designed for balanced Twin Cam models. This comprehensive kit allows you to convert your stock engine to a 124 cubic inch displacement using existing crankcases, providing significant power gains and enhanced performance. The kit includes S&S Super Stock® 91 cc cylinder heads, 4.125-inch big bore cylinders, forged big bore flattop pistons, and a 4.625-inch stroke flywheel assembly, all engineered for durability and optimal performance. The S&S 640 gear drive Easy Start cams, premium tappets, adjustable pushrods, and roller rocker arms work together to deliver smooth operation and increased torque. All necessary hardware, gaskets, and detailed instructions are included, ensuring straightforward installation. Made in the USA, this kit requires EFI system recalibration, and fuel or ignition systems are not included. Although the engine becomes approximately 0.960 inches taller, there are no frame clearance issues, and a stock EFI throttle body will fit because the cylinder head manifold mounting surfaces are specially machined to accommodate a stock-length manifold. This versatile upgrade is ideal for riders seeking to boost their Twin Cam’s power output while maintaining compatibility with existing components and systems. Proper clearance checks and assembly specifications should be verified during installation to ensure optimal performance and safety.
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