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Enhance your Harley-Davidson M8 engine with the S&S CYCLE 128" Power Package, designed for optimal performance and durability. This high-performance big bore kit increases engine displacement from 114"/117" to 128" without requiring case machining, making it a straightforward upgrade for serious riders. Featuring 4-1/4" bore cylinders with 11:1 forged pistons, the kit ensures reliable power delivery and longevity. The package includes an oil pump and cam plate with a blue anodized finish, providing improved oil flow capacity on both feed and scavenge sides, which aids in maintaining engine cleanliness and efficiency. The removable passage plugs facilitate servicing, while the independent scavenge sections for the flywheel cavity and camchest enhance oil circulation and debris removal. Built-in debris screens and a magnet in the camchest work together to prevent contaminants from entering the oil pump, thereby prolonging engine life. The adjustable pressure relief valve allows fine-tuning of oil pressure even with the kit installed, ensuring optimal lubrication under various operating conditions. The set also includes high-quality Quikee chrome pushrods with durable pushrod tubes, along with premium S&S tappets and black-coated, billet aluminum tappet cuffs for increased stability at high rpm and lift. The included S&S 550 cams are specifically designed for big bore applications, delivering increased torque and horsepower. Paired with S&S valve springs capable of handling up to .605" lift, these components support high-performance cam profiles. The package’s chain drive system features a wrinkle black finish with highlighted fins, combining aesthetic appeal with durability. Overall, this comprehensive power package offers a significant boost in performance, reliability, and style for your Harley-Davidson M8 engine, making it an ideal upgrade for enthusiasts seeking maximum power and long-term dependability.
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