S&S Cycle 124 Power Package Fits Harley-Davidson Twin-Cooled M8 107 2017-2022

S&S Cycle 124 Power Package Fits Harley-Davidson Twin-Cooled M8 107 2017-2022

Lift a Twin-Cooled Milwaukee-Eight 107 to 124 cubic inches with a Twin-Cooled-specific bolt-on big-bore kit. The S&S Cycle 124 Power Package WOC carries the same 107-to-124 inch big-bore conversion as the oil-cooled family, packaged for the Twin-Cooled cylinder-jacket configuration on M8 Touring chassis.

Key Features

• Complete 124 cubic-inch big-bore conversion kit engineered for the Twin-Cooled cylinder-jacket configuration on M8 Touring chassis
• S&S 107-to-124 inch big-bore cylinder set with 4.250 inch bore and S&S forged pistons at 11.1:1 compression
• S&S 550 cam designed to fit big-bore applications, available in chain-drive or gear-drive configuration
• S&S precision-machined billet aluminum oil pump and cam plate with independent scavenge sections, debris screens in both scavenge pickups, a cam-chest magnet, 44 percent supply-side and 58 percent scavenge-side flow increase, and an adjustable pressure-relief valve
• S&S Quickee pushrods (chrome or gloss-black pushrod tubes per variation finish)
• S&S precision tappets with hard-anodized black billet aluminum tappet cuffs
• S&S high-performance conical single-wire valve springs with top collars, keepers, and valve seals
• Chain-drive variations include the S&S precision billet aluminum cam-chain tensioner
• Available finishes: Chrome Pushrods/Highlighted Fins, Black Pushrods/Highlighted Fins

Technical Specifications

• Displacement: 124 cubic inches (from 107 ci Twin-Cooled stock)
• Bore: 4.250 inch
• Compression Ratio: 11.1:1
• Camshaft: S&S 550, chain-drive or gear-drive
• Oil Pump and Cam Plate: S&S precision-machined billet aluminum
• Pushrods: S&S Quickee (chrome or gloss-black)
• Tappets: S&S precision with billet aluminum tappet cuffs
• Valve Springs: S&S conical single-wire
• Country of Origin: United States

Fitment Notes

• Compatible with Harley-Davidson 2017-2022 Twin-Cooled Milwaukee-Eight Touring chassis with 107 cubic-inch base displacement.
• Excludes oil-cooled M8 (covered by the 124 Power Package OC family) and excludes 114 and 117 cubic-inch M8 platforms (covered by the 128 Power Package).
• S&S M8 head bolts (PN 900-1006) are required for installation and sold separately.
• The kit assumes a serviceable 2017-2022 Twin-Cooled M8 107 crankcase as the installation base; throttle body, intake, exhaust, and ECM tune are not included.
• The new 124 displacement requires an ECM calibration flash.
• Refer to the Fitment tab for the full platform breakdown.
• Not affiliated with or endorsed by Harley-Davidson.