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The S&S Cycle 128-Inch Power Package Engine Performance Kit (Part Number: 310-1107B) is designed to significantly enhance the performance of your Big Twin motorcycle engine. This bolt-on kit increases engine displacement from 114 inches to 128 inches with a 4-1/2 inch stroke, providing a substantial boost in power without requiring case machining. The kit features high-quality 4-1/4 inch bore cylinders paired with 11:1 forged pistons, ensuring durability and reliable compression for high-performance riding.
The included S&S oil pump and cam plate, finished with a striking blue anodized coating, contribute to improved oil flow and engine longevity. Passage plugs are removable for easy servicing, and the design incorporates independent scavenge sections for the flywheel cavity and cam chest. Debris screens are installed in both scavenge pickups, with a magnet in the cam chest to prevent debris from entering the oil pump, further protecting engine components.
The kit offers increased oil flow capacity on both feed and scavenge sides, ensuring efficient lubrication during high-stress riding conditions. An adjustable pressure relief valve allows tuning without removing the unit from the engine, providing convenience for fine-tuning performance. Included are Quickee pushrods with chrome pushrod tubes, premium S&S tappets, and black-coated, hard-anodized billet aluminum tappet cuffs that enhance tappet stability at high RPM and lift.
Designed for big bore applications, the S&S 550 cams are optimized for maximum performance, working seamlessly with valve springs rated up to .605 inch lift. The high-performance conical single-wire springs complement the cams, maintaining stability and durability during aggressive riding. All necessary gaskets, bearings, and hardware are included for a straightforward bolt-on installation. Made in the USA, this comprehensive kit transforms your engine's capabilities, delivering increased horsepower, torque, and overall performance for demanding motorcycle enthusiasts.
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