S&S Cycle 128-Inch Power Package Engine Performance Kit - Gear Drive 310-1108A

128" Power Package Engine Performance Kit - Gear Drive Enhance your Harley-Davidson Big Twin engine with the S&S Cycle 128-Inch Power Package Engine Performance Kit. Designed for 114" and 117" engines with a 4-1/2" stroke, this bolt-on kit delivers significant power gains without requiring case machining. The kit features 4-1/4" bore cylinders fitted with 11:1 forged pistons, providing reliable high-performance compression. The inclusion of an S&S oil pump and cam plate with a stylish blue anodized finish ensures durability and efficient oil circulation. Passage plugs are removable for easy servicing, while independent scavenge sections for the flywheel cavity and cam chest help maintain optimal oil flow. Both scavenge pickups are equipped with debris screens, and a magnet in the cam chest prevents debris from entering the oil pump, protecting engine components and extending engine life. The increased oil flow capacity on both feed and scavenge sides ensures adequate lubrication during high-performance operation. An adjustable pressure relief valve allows fine-tuning of oil pressure without requiring removal of the unit from the engine, enhancing convenience. The kit includes Quickee pushrods with chrome pushrod tubes, S&S premium tappets, and high-quality, black-coated, billet aluminum tappet cuffs for improved stability under high-lift, high-rpm conditions. S&S 550 cams are specifically designed for big bore applications, working seamlessly with valve springs up to .605" lift. The high-performance conical single-wire springs are engineered for durability and optimal valve control. All necessary gaskets, bearings, and hardware are included for a straightforward bolt-on installation, making this kit ideal for enthusiasts seeking a reliable, high-power upgrade. Made in the U.S.A., the S&S Cycle 128" Power Package Engine Performance Kit offers a comprehensive solution for maximizing engine output and efficiency in a hassle-free manner. Features: Big-bore bolt-on kit increases engine displacement to 128" with no case machining requiredIncludes 4-1/4" bore cylinders with 11:1 forged pistons for high compression and powerS&S oil pump and cam plate with blue anodized finish for durability and efficient oil circulationRemovable passage plugs for easy servicing of oil passagesIndependent scavenge sections for flywheel cavity and cam chest to ensure optimal oil flowDebris screens in both scavenge pickups to prevent contaminants from entering the oil systemMagnet in cam chest helps prevent debris from entering the oil pump, protecting engine componentsIncreased oil flow capacity on both feed and scavenge sides for better lubrication during high-performance operationAdjustable pressure relief valve allows fine-tuning of oil pressure without removing the unit from the engineQuickee chrome pushrods with matching pushrod tubes for reliable valvetrain operationPremium S&S tappets and black-coated, billet aluminum tappet cuffs for improved stability at high lift and RPMS&S 550 cams designed specifically for big bore applications, compatible with valve springs up to .605" liftHigh-performance conical single-wire valve springs for durability and valve controlIncludes all necessary gaskets, bearings, and hardware for straightforward bolt-on installationMade in the USA, offering quality and reliability for demanding engine upgrades