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® 4” 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.