128" Power Package Engine Performance Kits / '17-'23 114"-117" M8 Motors

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Elevate your Harley Davidson M-Eight from a 114”/117” engine to a commanding 128” powerhouse with the S&S Cycles 128” Power Packages. This big-bore bolt-on kit is meticulously designed for '17-Up models, offering a significant upgrade without the need for case machining. Here’s a deep dive into the components and benefits of installing this power package:

Key Features:

• Bolt-On Convenience: Increases your M-Eight's displacement to 128" seamlessly, with a 4-1/4" bore and 11:1 forged pistons, enhancing performance dramatically.
• Enhanced Oil System: Features an S&S oil pump/cam plate with a blue anodized finish, independent scavenge sections for the flywheel cavity and cam chest, and a magnet in the cam chest to prevent debris from entering the oil pump.
• Optimized Oil Flow: The kit includes increased oil flow capacity on both the feed and scavenge sides, along with an adjustable pressure relief valve that can be tuned with the engine installed.
• Pushrod and Tappet Upgrades: Comes with Quikee pushrods and chrome pushrod tubes, S&S premium tappets, and hard-anodized, black coated billet aluminum tappet cuffs, improving stability in high-lift, high-RPM situations.
• Performance Cams and Valve Springs: Equipped with S&S 550 cams designed for big bore applications and valve springs that are compatible with cams up to .605" lift, featuring a high-performance conical single-wire spring design.
• Complete Kit: All necessary gaskets, bearings, and hardware for a bolt-on installation are included, ensuring a smooth upgrade process.

Why Choose the 128” Power Package?

• Unmatched Performance Upgrade: Dramatically increase both horsepower and torque, offering an unmatched riding experience.
• No Extensive Modifications Required: Designed to fit within the stock engine casing, this kit simplifies the upgrade process, retaining the original engine aesthetics while boosting performance.
• Durability and Reliability: Made in the U.S.A. with high-quality components, ensuring your engine not only gains power but also maintains reliability and longevity.

Installation Tips:

• Professional Installation Recommended: Given the complexity of this upgrade, professional installation is advised to ensure optimal performance and safety.
• Compatibility Check: Ensure this power package is compatible with your Harley model, especially considering specific requirements or existing modifications.

Transform your ride with the S&S Cycles 128” Power Packages for M-Eight and experience the pinnacle of performance on the open road.