Bolt-In Sidewinder 4" Big Bore Kits / '99-'17 Twin Cams

No Shipping to CA Unleash the full potential of your Twin Cam engine with the groundbreaking S&S Cycles BOLT-IN SIDEWINDER Big Bore Kit. Designed for effortless installation without the need for machining, balancing, or splitting the crankcases, this kit can be installed with the engine still in the frame, ensuring a hassle-free upgrade path to significantly more power. What Makes It Exceptional: Effortless Installation: Bolt-in design means no complex engine disassembly required. Superior Heat Management: Features a cast ductile iron sleeve in cast aluminum for enhanced heat transfer, keeping your engine cooler. Power Boost: Elevates 88 engines to 100, and 96 / 103 engines to a robust 110, providing a noticeable increase in performance. Optimized Compression: Achieves a 10.5:1 compression ratio with stock 85cc heads, creating a dependable and streetable engine that shines with performance cams. Comprehensive Kit: Includes everything you need cylinders, forged pistons, rings,