S&S CYCLE 129\" Power Package Engine Performance Kit — 4.320\" bore, 11.0:1 – 18-26 Softail, 18, 25 Touring, 17-25 Trike

The 129" Power Package Engine Performance Kit upgrades a 107" M8 to a 129" big-bore engine with a bolt-on installation that requires no case machining.

• Big bore 4.320" cylinder with 11.0:1 forged pistons for higher performance and durability.
• S&S oil pump and cam plate with removable passage plugs for easy servicing.
• Independent scavenge sections for the flywheel cavity and cam chest, each with debris screens and a magnet in the cam chest to help protect the oil pump.
• Increased oil flow capacity on feed and scavenge sides plus an adjustable pressure relief valve that can be set with the unit installed.
• Quickee pushrods with pushrod tubes, premium tappets, and hard-anodized billet tappet cuffs for improved valvetrain life.
• S&S valve springs support cams up to 0.605" lift and the HPT496 cam is tuned for big-bore applications.
• MLS multi-layer steel head gasket, includes 129 cam cover badge, retains stock engine height and original serial numbers, and works with stock crankcases and roller rocker arms.
• Made in the USA for reliable fitment and finish.