S&S Cycle - 128" Power Packages fits '17-'21 M8 Oil-Cooled Engines

S&S Cycle - 128" Power Packages fits '17-'20 M8 Oil-Cooled Engines

This Power Package increases your 114"/117" with a 4-1/2" stroke M8 to 128". It is available in a wrinkle black or black granite finish and your choice of cylinders with or without fin highlighting. You can also choose between a chain drive cam or a gear drive cam.

Features

• 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:
• Work well with cams up to .605 lift
• High-performance conical single wire spring
• MADE IN U.S.A