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The S&S Cycle 129" Power Package HPT496 is engineered to transform your 107" M8 engine into a high-performance powerplant with increased displacement and optimized components. This bolt-on kit increases engine capacity from 107 inches to 129 inches without requiring case machining, making installation straightforward for experienced builders. The package includes a big bore 4.320" cylinder with forged pistons featuring an 11.0:1 compression ratio, delivering significant power gains and improved combustion efficiency. An S&S oil pump and cam plate are integrated into the design, ensuring reliable lubrication and cam operation. Passage plugs are removable for servicing, and independent scavenge sections within the oil system facilitate efficient debris removal from the flywheel cavity and cam chest, enhancing engine longevity. Debris screens in both scavenge pickups and a magnet in the cam chest help prevent contaminants from entering the oil pump, maintaining clean oil flow during operation. The kit offers increased oil flow capacity on both feed and scavenging sides, supporting high-performance demands. An adjustable pressure relief valve allows fine-tuning of oil pressure with the unit installed, providing better engine control. Quickee pushrods with pushrod tubes, premium S&S tappets, and billet aluminum, black-coated tappet cuffs ensure durability and precise valvetrain operation. The included S&S valve springs are designed to work with cams up to 0.605" lift, and the high-performance conical single wire spring design offers reliable spring pressure. The HPT496 cam, tailored specifically for big bore applications, provides substantial torque and horsepower enhancements. Multi-layered steel (MLS) head gaskets improve sealing and durability. The package also features a 129" cam cover badge and retains the stock engine height, making it compatible with stock crankcases and roller rocker arms from both first and second-generation engines. The kit preserves original engine serial numbers and works seamlessly with stock valve springs, ensuring compatibility with existing components. Made in the USA, this power package combines performance, durability, and ease of installation for serious motorcycle enthusiasts seeking to maximize their M8 engine's potential.
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