S&S Big Bore 124" Kit för H-D M8. / 124" Power Package Engine Performance Kit. S&S USA #310-1055A
Fitment Notes & Exceptions: For Water Cooled 107" Milwaukee Eight engines only! Will not fit Oil Cooled models.
Due to inherent characteristics of gear-driven cams, you may experience greater valve train noise.
- Big Bore Kit
- 107" to 124" Big bore kit
- Bolt on kit.
- No case machining required
- Forged pistons
- 11.1 Compression ratio
- Oil Pump/Cam Plate
- Precision machined from billet aluminum
- Blue anodized finish
- 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
- Adjustable pressure relief valve is adjustable with unit installed in engine
- Pushrods
- Quickee pushrods
- Tappets:
- S&S precision tappets
- Tappet Cuffs
- Hard anodized black coating
- 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 the U.S.A.
- Not recommended for Tri-Glide or other three wheel models including conversion due to lugging nature of these bikes
- 124" Package for '17 touring models & '18–’22 Harley Davidson models with 107" engine.
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