S&S Cycle 2017+ M8 129in Power Pack w/ Chrome Pushrod Tubes & Cam Chain Tensioner - Blk w/ Highlight

Upgrade your Harley-Davidson M8 engine with the S&S CYCLE 129" Power Package Engine Performance Kit, designed for optimal performance and durability. This kit transforms your 107" oil-cooled M8 into a powerful 129" engine without the need for case machining. It includes big bore cylinders with matching cam, cam plate, and oil pump for seamless compatibility and reliable operation.

Independent scavenge sections for the flywheel cavity and cam chest optimize oil flow, and a magnet in the cam chest traps debris. Features include high-performance conical single-wire S&S valve springs for improved valve control at high RPM. The kit retains original engine serial numbers and has removable passage plugs for easy servicing. Debris screens in both scavenge pickups protect the oil system. Multi-layered steel (MLS) head gaskets ensure a reliable seal. The included performance-matched 550 cam provides a significant boost in power and torque.

Designed to work seamlessly with the stock crankcase, this kit offers an upgrade path without extensive modifications. Made in the USA.