Engine

Precision CNC machined forged aluminum Increased structural strength Dimensional stability Freedom for internal porosity Separate scavenge sections for flywheel cavity and cam chest scavenge each area more efficiently with no interference Gerotors are designed to tolerate more pinion shaft runout without damage Cam chest...

Complete 110" Big Bore and Cam Chest Kits!  Upgrade to the biggest bolt-in performance kit S&S makes for 1999-2017 Harley-Davidson® big twins (except 2006 Dyna® models and 2017 touring models). Get everything you need in one package. Contains an S&S 4” big bore cylinder...