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

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

Lift a stock oil-cooled Milwaukee-Eight 107 to 124 cubic inches with one bolt-on big-bore kit. The S&S Cycle 124 Power Package is a no-case-machining cylinder, piston, cam-chest, and oil-pump conversion that drops a 124 performance build into a 2017-2022 oil-cooled M8 Touring or Softail chassis.

Key Features

• Complete 124 cubic-inch big-bore conversion kit, bolt-on with no case machining required
• 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 hand-assembled for low leak-down and fast pump-up, plus hard-anodized black billet aluminum tappet cuffs for stability at high lift and high rpm
• 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 with thicker shoe, direct chain oiling, and larger pressure piston
• Available finishes: Chrome Pushrods/Highlighted Fins, Black Pushrods/Highlighted Fins, Black Pushrods/Non-Highlighted Fins

Technical Specifications

• Displacement: 124 cubic inches (from 107 ci 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, independent scavenge, debris screens, 44 percent feed and 58 percent scavenge flow increase
• Pushrods: S&S Quickee (chrome or gloss-black)
• Tappets: S&S precision with hard-anodized billet aluminum tappet cuffs
• Valve Springs: S&S conical single-wire with top collars, keepers, and valve seals
• Cam-Chain Tensioner (chain-drive variations): S&S precision billet aluminum
• Country of Origin: United States

Fitment Notes

• Compatible with Harley-Davidson 2017-2022 oil-cooled Milwaukee-Eight Touring and Softail chassis with 107 cubic-inch base displacement.
• Excludes 114 and 117 cubic-inch M8 platforms (those are covered by the 128 Power Package) and excludes all Twin-Cooled M8 configurations (covered by the 124 Twin-Cooled Power Package).
• S&S M8 head bolts (PN 900-1006) are required for installation and sold separately.
• The kit assumes a serviceable 2017-2022 oil-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; a Dynojet PV-3 or PV-4 or an HD Pro-Street tuner is the typical route.
• Refer to the Fitment tab for the full year and platform breakdown.
• Not affiliated with or endorsed by Harley-Davidson.