S&S CYCLE 129" Power Package Engine Performance Kit for M8 - Gear Drive, Oil Cooled, Model 310-1228

S&S CYCLE

S&S CYCLE 129" Power Package Engine Performance Kit for M8 - Gear Drive, Oil Cooled, Model 310-1228

Product type: Big Bore Kits

Vendor: S&S CYCLE

SKU : 0904-0113

Regular price $3,559.95 USD

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

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129" Power Package Engine Performance Kit - Gear 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 seamless installation, this kit allows you to extend your engine's length from 107 inches to 129 inches without requiring case machining, making it an efficient choice for performance enthusiasts. The big bore cylinders are matched with a high-performance cam, cam plate, and oil pump, ensuring optimal power delivery and reliability. The kit features independent scavenge sections for the flywheel cavity and cam chest, promoting efficient oil flow and engine longevity. A magnet embedded in the cam chest acts as a debris barrier, helping to prevent contaminants from entering the oil pump and maintaining engine cleanliness.

Constructed with quality materials, the kit includes conical single-wire S&S valve springs designed for high performance, ensuring reliable valve operation at increased RPMs. Original engine serial numbers are retained, allowing for easy identification and compliance with service records. Passage plugs are removable for straightforward servicing, and debris screens are integrated into both scavenge pickups to further protect the engine. The use of MLS (multi-layered steel) head gaskets enhances sealing performance under high-pressure conditions, contributing to engine durability. The included performance-matched 550 cam offers a significant boost in power and torque, optimized to work with the stock crankcase for a straightforward upgrade. Proudly made in the USA, this performance kit provides a comprehensive solution for riders seeking enhanced engine output and reliability.

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