Select type, year, make, and model
Upgrade your Harley-Davidson M8 with the S&S CYCLE 129" Power Package Engine Performance Kit, designed to boost performance without requiring case machining. This kit features big bore cylinders that increase displacement from 107 inches to 129 inches, providing enhanced power and torque for your motorcycle. The cylinders come with a matching cam, cam plate, and oil pump, ensuring optimal compatibility and performance. The independent scavenge sections for the flywheel cavity and cam chest improve oil flow and durability, while the magnet in the cam chest helps prevent debris from entering the oil pump, extending engine life. Made in the USA, this kit includes high-performance conical single-wire S&S valve springs that improve valve control at higher RPMs. The original engine serial numbers are retained for easy registration and warranty purposes, and removable passage plugs facilitate servicing. Debris screens in both scavenge pickups further protect the engine, and MLS (multi-layered steel) head gaskets ensure reliable sealing under high pressure. The kit is performance matched with a 550 cam, offering a significant upgrade in power and throttle response. It is designed to work seamlessly with the stock crankcase, making installation straightforward for experienced builders or professional mechanics. Whether you're looking to increase horsepower or improve overall engine efficiency, this performance kit provides a comprehensive solution that combines durability, improved airflow, and enhanced performance, all crafted to meet the demands of high-performance Harley-Davidson engines.
Features:
US Dollars
