S&S CYCLE 128" Power Package for 114"/117" Oil Cooled M8 — 128", 4.250" bore, 4.500" stroke, 11.1:1, Wrinkle Black – 18-26 Softail, 19-26 Touring, 20-25 Trike, 22-23 CVO

The 128" Power Package for 114"/117" M8 is a bolt-on big-bore kit engineered to increase displacement without case machining. Made in the USA, this complete kit pairs big-bore cylinders and forged pistons with upgraded oiling components and high-performance valvetrain hardware for durable, ride-ready power. 🏍️

• Big-bore bolt‑on kit increases displacement using a longer stroke crank—no case machining required
• 4‑1/4" bore cylinders with high-compression forged pistons for strength and thermal stability
• S&S oil pump/cam plate with blue anodized finish; removable passage plugs and independent scavenge sections for improved serviceability
• Debris screens on scavenge pickups and a camchest magnet to help protect the oil pump
• Quikee pushrods with chrome pushrod tubes, premium tappets, and hard-anodized tappet cuffs to improve stability at high lift and rpm
• S&S 550 cam optimized for big-bore applications and high-performance valve springs with conical single-wire design
• Includes all necessary gaskets, bearings and hardware for bolt-on installation

Designed for enthusiasts and builders who want a reliable, high-performance upgrade, this power package focuses on oiling improvements, valvetrain stability, and straightforward installation.