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Upgrade your Harley-Davidson M8 engine with the S&S Cycle 129" Power Package HPT496, designed specifically for 107" M8 models. This high-performance bolt-on kit increases engine displacement to 129 inches without requiring case machining, providing a significant boost in power and torque. The kit features a big bore 4.320" cylinder with forged pistons rated at 11.0:1 compression, delivering reliable performance and durability. The included components such as the S&S oil pump and cam plate ensure efficient lubrication and optimal engine operation. Passage plugs are removable for straightforward servicing, and independent scavenge sections for the flywheel cavity and cam chest enhance oil flow and debris removal, contributing to engine longevity. The debris screen in both scavenge pickups and a magnet in the cam chest work to prevent debris from entering the oil pump, safeguarding vital engine components. This package also includes adjustable pressure relief valves that can be fine-tuned while the unit is installed, allowing precise oil pressure management. Quickee pushrods with pushrod tubes, premium S&S tappets, and hardened anodized, black-coated tappet cuffs made from billet aluminum ensure high durability and performance. The S&S valve springs are compatible with cams up to 0.605" lift, featuring a high-performance conical single wire spring design for reliable valve operation. The HPT496 cam, specifically designed for big bore applications, optimizes performance with a smooth power curve. The multi-layered steel (MLS) head gasket ensures a proper seal under increased pressures. This package includes a 129" cam cover badge for an authentic custom look and is made in the USA, maintaining stock engine height and compatibility with stock crankcases, stock and S&S roller rocker arms, and both first and second-generation stock valve springs. The kit is engineered to retain original engine serial numbers and is suitable for use with stock or upgraded components, making it an ideal choice for performance enthusiasts seeking to enhance their Harley-Davidson M8 engine without extensive modifications.
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