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

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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, piston pins, clips, and gaskets.
• Proudly Made in the U.S.A.: Quality and craftsmanship that you can trust, backed by S&S Cycles' legacy of excellence.

Elevate Your Twin Cam Experience

Whether cruising the streets or powering through the highways, the S&S Cycles BOLT-IN SIDEWINDER Big Bore Kit transforms your Twin Cam engine into a more powerful, responsive, and enjoyable ride. It's the perfect upgrade for riders seeking a significant performance increase without compromising reliability or the need for extensive modifications.

• NOTE: Not for use with S&S 79cc heads.
• Not recommended for Trike models or use on Twin Cooled models.