S&S CYCLE 129" Power Package for M8 — 129", 11.0:1, Gear Drive – 18-23 Softail, 17-19, 21-23 Touring, 22 CVO, 17-23 Trike

Build more power from your 107" M8 with this S&S CYCLE bolt-on performance kit that increases displacement to 129" without case machining.

It includes 4.32" bore cylinders, forged pistons with an 11.0:1 compression ratio, S&S 550 cams, Quickee pushrods, premium tappets, and valve springs designed to work with cams up to 0.605" lift.

The included S&S oil pump/cam plate features independent scavenge sections, debris screens in both scavenge pickups, a cam chest magnet, increased oil flow capacity, and an adjustable pressure relief valve that can be set with the unit installed.

All necessary gaskets, bearings, and hardware are included for installation. Made in the USA. Not for Trike models.