S&S CYCLE Power Pack - Twin Cooled - M8 310-1107B

Big Bore Kit: Bolt on kit. No case machining required 4.250" bore Forged pistons 11.1: compression ratio Oil Pump/Cam Plate Precision machined from billet aluminum Passage plugs removable for servicing Independent scavenge sections for flywheel cavity and cam chest Debris screens in both scavenge pickups Magnet in cam chest to help to stop debris from entering oil pump Increased flow capacity on both feed and scavenge side Pressure Relief Valve is adjustable with unit installed in engine Pushrods: Quickee pushrods Tappets: S&S premium tappets Tappet Cuffs: Billet aluminum construction Stronger than stock material eliminates distortion Improve tappet stability in high lift and high rpm situations Cam: S&S 550 Cam- Designed for Big Bore applications Valve Springs: