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Enhance your Harley-Davidson M8 engine with the S&S Cycle 129" Power Package, designed to deliver increased performance and reliability. This bolt-on kit boosts your 107-inch M8 to 129 inches of displacement without requiring case machining, making it a straightforward upgrade for compatible engines. The package features a big bore 4.320-inch cylinder with high-performance forged pistons and an advanced HPT496 cam optimized for big bore applications. The combination of these components provides increased power output and improved throttle response for a more exhilarating riding experience.
The kit includes an S&S oil pump and cam plate with removable passage plugs for easy servicing, as well as independent scavenge sections for the flywheel cavity and cam chest, ensuring efficient oil flow and engine lubrication. Debris screens in both scavenge pickups and a magnet in the cam chest help prevent debris from entering the oil pump, protecting your engine and prolonging its lifespan. The setup maintains stock engine height and is compatible with stock crankcases, roller rocker arms, and both first and second-generation valve springs, providing seamless integration with your existing setup.
Featuring quickee pushrods with pushrod tubes, S&S premium tappets, and hard anodized, black-coated billet aluminum tappet cuffs, this kit emphasizes durability and performance. The included S&S valve springs are rated for cams with up to 0.605-inch lift, supporting aggressive cam profiles such as the HPT496. An MLS head gasket ensures a reliable seal under high-pressure conditions. A 129 cam cover badge and the fact that it is made in the USA complete the package, offering a high-quality, American-made upgrade that preserves your original engine serial numbers. This power package is designed to work with stock valve springs, making it a versatile and reliable choice for enhancing your Harley-Davidson M8 engine.
Whether you're looking for increased horsepower, improved efficiency, or a combination of both, this S&S Cycle 129" Power Package provides a professional-grade upgrade to take your motorcycle to the next level.
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