As low as $874.49/mo with or . (Pay in 4 interest-free payments)
S&S Cycle 129" Power Package for M8 (Gear Drive) — Wrinkle Black, Oil Cooled Upgrade your Harley-Davidson 107" M8 to a thrilling 129" with the S&S CYCLE 129" Power Package for M8 . This bolt-on big-bore kit delivers strong street performance with gear drive , oil cooling , and a rugged wrinkle black finish—without case machining. Key Features Big-bore bolt-on kit increases 107" M8 to 129" with no case machining required 4.32" bore cylinders with 11.0:1 compression forged pistons S&S oil pump/cam plate with blue anodized finish Removable passage plugs for easier servicing Independent scavenge sections for flywheel cavity and cam chest Debris screens in both scavenge pickups plus magnet in cam chest to help protect the oil pump Increased oil flow capacity on feed and scavenge sides Adjustable pressure relief valve adjustable with the unit installed Quickee pushrods , S&S premium tappets , and billet hard-anodized black tappet cuffs S&S 550 cams engineered for big-bore applications Valve springs for cams up to 0.605" lift Includes all necessary gaskets, bearings, and hardware for bolt-on installation Made in the USA Specifications Displacement: 129" Bore Size: 4.320" Stroke: 4-3/8" Compression Ratio: 11.0:1 Cam Drive: Gear Cooling: Oil Cooled Riding Style: Street Finish: Wrinkle Black, Non-Highlighted Fins (Black pushrod tubes) Weight: 46.2 lbs | Dimensions: 27.25" x 12" x 20.5" Note: Not for any Trike models.
Big-bore bolt-on kit increases 107" M8 to 129" with no case machining required
4.32" bore cylinders with 11.0:1 compression ratio forged pistons
S&S oil pump/cam plate with 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
S&S premium tappets
S&S hard-anodized, black coated tappet cuffs are billet aluminum construction
S&S 550 cams are designed for big bore applications
S&S valve springs work with cams up to 0.605" lift
High-performance conical single wire spring design
All necessary gaskets, bearings and hardware for bolt on installation included
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. (Pay in 4 interest-free payments)
