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Upgrade your Harley-Davidson M8 engine with the S&S Cycle 129-inch Power Package Engine Performance Kit, designed for seamless installation without case machining. This comprehensive kit allows you to extend your engine's length from 107 inches to 129 inches, providing increased displacement and power. The kit includes high-performance big bore cylinders complete with matching cam, cam plate, and oil pump, ensuring optimal compatibility and performance. Its independent scavenge sections for the flywheel cavity and cam chest help maintain engine cleanliness, while the embedded magnet in the cam chest assists in debris prevention, protecting vital oil pump components. Crafted with precision, the kit features high-performance conical single-wire S&S valve springs that enhance valve control at high RPMs, contributing to overall engine durability and efficiency. The design preserves the original engine serial numbers for easy identification and warranty purposes, and removable passage plugs facilitate straightforward servicing. Additionally, debris screens are integrated into both scavenge pickups to prevent contaminants from circulating through the oil system. Multi-layered steel (MLS) head gaskets ensure a reliable seal under high-pressure conditions, and the included performance camshaft is matched for optimal power delivery. Compatible with stock crankcases, this kit requires no major modifications, making it a practical upgrade for seasoned builders and enthusiasts alike. Made in the USA, the S&S Cycle 129-inch Power Package is engineered for reliable performance, increased horsepower, and enhanced engine longevity, making it an ideal upgrade for riders seeking maximum output from their M8 engine.
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