For M8 models with 4.500in. stroke
Big-bore bolt-on kit increases your 114in./ 117in. with 4.5in. stroke M-Eight to 128in. with no case machining required
4 1/4in. bore cylinders with 11:1 forged pistons
Wrinkle black or black granite finish cylinders with or without fin highlighting
S&S oil pump/ cam plate with a blue anodized finish
Passage plugs are removable for servicing
Independent scavenge sections for flywheel cavity and cam chest
Debris screen in both scavenge pickups
Magnet in cam chest to help prevent debris from entering the oil pump
Increased oil flow capacity on both the oil feed and scavenge side
Adjustable pressure relief valve can be adjusted with the unit installed in the engine
Quickee pushrods with chrome pushrod tubes
S&S premium tappets
S&S hard-anodized, black coated tappet cuffs are billet aluminum construction
Improve tappet stability in high lift, high rpm situations
S&S 550 cams designed for big bore applications (gear or chain drive cams available)
S&S valve springs; work with cams up to .605in. lift
High-performance conical single-wire spring design
All necessary gaskets, bearings and hardware for bolt-on installation included
Made in the U.S.A.
S&S does not recommend compression ratios higher than 10:1 for Tri Glide or other three wheel models (including conversions) due to extra loads caused by the lugging nature of these bikes. Detonation and subsequent engine damage may result.
FOR CLOSED COURSE COMPETITION USE ONLY. NOT INTENDED FOR STREET USE. LEGAL IN CALIFORNIA ONLY FOR RACING VEHICLES WHICH MAY NEVER BE USED, OR REGISTERED OR LICENSED FOR USE, UPON A HIGHWAY. NOT LEGAL FOR SALE OR USE NATIONWIDE ON ANY FEDERAL POLLUTION CONTROLLED MOTOR VEHICLE UNDER THE CLEAN AIR ACT.