S&S CYCLE 128" Power Package for 114"/117" Oil Cooled M8 — 4.5" stroke, 4.25" bore – 18-25 Softail, 19-25 Touring, 22-23 CVO, 20-25 Trike

Made in the USA bolt-on big-bore kit designed for oil-cooled M8 engines built on 114"/117" cases, engineered to increase displacement without case machining.

• Large-bore cylinders with forged pistons and high compression for stronger top-end power.
• Premium oil pump and cam plate with a blue anodized finish; passage plugs are removable for servicing.
• Independent scavenge sections for flywheel cavity and camchest, with debris screens in both pickups and a camchest magnet for added protection.
• Increased oil flow capacity on feed and scavenge sides and an adjustable pressure relief valve accessible with the unit installed.
• Chrome pushrod tubes with reinforced pushrods, premium tappets and hard-anodized billet tappet cuffs to improve stability in high-lift, high-rpm situations.
• High-performance cam designed for big-bore applications and conical single-wire valve springs rated for high lifts.
• Includes all necessary gaskets, bearings and hardware for a bolt-on installation.
• Not recommended for Tri-Glide or other three-wheel models, including conversions, due to lugging characteristics.