S&S CYCLE 129" Power Package Engine Performance Kit for M8 - Chain Drive, Oil Cooled, Part 310-1226

S&S CYCLE

S&S CYCLE 129" Power Package Engine Performance Kit for M8 - Chain Drive, Oil Cooled, Part 310-1226

Product type: Big Bore Kits

Vendor: S&S CYCLE

SKU : 0904-0106

Regular price $3,359.95 USD

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129" Power Package Engine Performance Kit - Chain Drive - Oil Cooled - Non-Highlighted Fins - M8 Upgrade your Harley-Davidson M8 engine...

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129" Power Package Engine Performance Kit - Chain Drive - Oil Cooled - Non-Highlighted Fins - M8

Upgrade your Harley-Davidson M8 engine with the S&S CYCLE 129" Power Package Engine Performance Kit, designed for precise performance enhancement and reliable operation. This kit transforms a 107" oil-cooled M8 engine into a powerful 129" engine without the need for case machining, making installation straightforward for experienced builders. The high-performance big bore cylinders are supplied with matching cam, cam plate, and oil pump, ensuring all components are optimized for increased displacement and power output.

The kit features independent scavenge sections for the flywheel cavity and cam chest, along with a magnet in the cam chest to help prevent debris from entering the oil pump, contributing to longer engine life and reduced maintenance. It includes high-quality conical single-wire S&S valve springs, designed to handle increased valve lift and high RPM operation, promoting maximum airflow and efficiency. Original engine serial numbers are retained, maintaining authenticity and ease of registration or warranty purposes.

Passage plugs are removable for servicing, and debris screens are integrated into both scavenge pickups to protect vital engine components from contaminants. The use of MLS (multi-layered steel) head gaskets ensures a reliable seal under high-pressure conditions, preventing leaks and maintaining compression. The performance-matched 550 cam provides a balanced blend of power and drivability, making this kit suitable for street and performance applications alike. Compatibility with stock crankcases simplifies installation, enabling a seamless upgrade for Harley-Davidson owners seeking enhanced performance without major modifications.

Proudly made in the USA, the S&S CYCLE 129" Power Package Engine Performance Kit offers a comprehensive solution for those looking to significantly boost their engine’s output while maintaining durability and factory compatibility.

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