🔥 The 128" Power Package Engine Performance Kit is a bolt-on big-bore solution designed to upgrade M-Eight engines with no case machining required. Ideal for riders seeking more displacement and higher rpm stability, this kit combines forged internals, premium cam components, and enhanced oiling for reliable performance.
- Big-bore bolt-on kit increases displacement using a longer stroke without case machining required
- 4-1/4" bore cylinders with 11:1 forged pistons for increased strength and compression
- S&S oil pump and cam plate finished in blue anodize; removable passage plugs for easy servicing
- Independent scavenge sections for the flywheel cavity and cam chest with debris screens and a magnet in the cam chest to reduce contamination
- Increased oil flow capacity on both feed and scavenge sides, plus an adjustable pressure relief valve serviceable with the unit installed
- Quickee pushrods with chrome tubes, S&S premium tappets and hard-anodized billet tappet cuffs to improve stability at high lift and rpm
- S&S 550 cams optimized for big-bore applications and S&S valve springs compatible with up to .605" lift
- High-performance conical single-wire spring design and all necessary gaskets, bearings, and hardware for bolt-on installation
- Made in the U.S.A. 🇺🇸
⚙️ This complete kit focuses on real-world serviceability: removable plugs, easily adjustable relief valve, and independent scavenge sections simplify maintenance. It’s engineered for robust performance and longevity under demanding conditions.
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