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Upgrade your Harley-Davidson M8 engine with the S&S Cycle 129" Power Package Performance Kit, designed to deliver exceptional power and reliability. This comprehensive kit allows you to extend your engine's length from 107 inches to 129 inches without requiring case machining, making installation straightforward and efficient. The kit features big bore cylinders that come with a matching cam, cam plate, and oil pump, ensuring optimal compatibility and performance. The independent scavenge sections for the flywheel cavity and cam chest help maintain clean oil flow, while the magnet in the cam chest helps prevent debris from entering the oil pump, extending engine longevity.
Constructed with high-performance conical single-wire S&S valve springs, the kit ensures reliable valve operation under demanding conditions. It retains the original engine serial numbers, preserving authenticity and resale value. Passage plugs are removable for easy servicing, and debris screens are installed in both scavenge pickups to prevent contaminants from entering the oil system. The MLS (multi-layered steel) head gaskets provide superior sealing and durability, while the performance-matched 550 cam enhances power delivery and throttle response. Compatible with stock crankcases, this kit is made in the USA, ensuring quality craftsmanship and reliable performance for your Harley-Davidson M8 engine.
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