S&S Cycle Power Pack for M8 with 4.375-Inch Stroke - Oil Cooled Black Finish - Part #310-1053C

Product type: Big Bore Kits

Vendor: S&S CYCLE

SKU : 0904-0140

Regular price $3,497.95 USD

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Power Pack - 4.375" Stroke - Oil Cooled - Black w/o Highlights - M8 The S&S Cycle Power Pack with a 4.375-inch...

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Power Pack - 4.375" Stroke - Oil Cooled - Black w/o Highlights - M8

The S&S Cycle Power Pack with a 4.375-inch stroke is a high-performance upgrade designed for M8 engines, offering enhanced power and durability. Crafted with precision and made in the USA, this bolt-on kit requires no case machining, making installation straightforward for experienced builders. It includes forged pistons, an oil pump, cam plate, pushrods, tappets, and tappet cuffs, all engineered for optimal performance and longevity. The kit features updated fins for improved cooling and a custom camshaft with valve springs to maximize airflow and combustion efficiency. The included oil pump and cam plate are precision machined from billet aluminum, with removable passage plugs for easy servicing and debris screens in both scavenge pickups to protect vital engine components. An integrated magnet in the camchest helps prevent debris from entering the oil pump, ensuring clean oil flow and extended engine life. The supply side sees a 44% flow increase, while the scavenge side benefits from a 58% flow increase, promoting better oil circulation and cooling. An adjustable pressure relief valve allows fine-tuning of oil pressure once installed, providing optimal lubrication under various operating conditions. The Quickee pushrods are designed for quick installation and reduced valve train noise from startup to shutdown. Tappets are hand-assembled with tight tolerances for low leak-down rates, contributing to efficient valve operation. The billet aluminum tappet cuffs are hard anodized in black for durability and stability during high lift and high RPM scenarios. Overall, this Power Pack is engineered to deliver significant power gains, improved engine reliability, and easier maintenance, making it an excellent choice for performance-minded Harley-Davidson M8 owners seeking a reliable upgrade.

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