S&S Cycle MK136B M8 Engine 2018-2024 Oil-Cooled Harley Davidson Softail

S&S Cycle MK136B M8 Engine 2018-2024 Oil-Cooled Harley Davidson Softail

The next generation of proven performance for 2018-2024 M-Eight HD Softail models, ready to install in your M8 Touring bike. We took our MK-series crankcases, married them to the 136″ cylinders and Flywheels, and then fit high-flow cylinder heads with +1mm valves and .605″ springs. This is everything you need to have the largest, most powerful, and most reliable crate engine on the market today.

MK136

• Forged pistons
• 4.320″ Bore, 4.625″ stroke
• 11:1 Compression ratio
• Accepts all HD OEM engine components
• S&S performance oil pump and cam support plate
• Premium tappets and tappet cuffs
• Billet aluminum covers
• Sprocket shaft spacer included
• Champion spark plugs
• Retains stock engine height
• Includes cam cover badge
• The gloss black powder coat finish matches the factory finish
• A huge displacement increase means a huge power increase crankcase
• For oil-cooled 2018-2024 Softail
• 1 Year warranty
• Made in the USA

CYLINDER HEADS

• High-flow cylinder heads with premium seats, guides, valves, springs, and seals
• +1mm oversized intake and exhaust valves
• Valves are .030″ longer than stock for improved valvetrain geometry
• .605″ Max lift valve springs
• High-strength alloy used in cylinder head casting, improved strength at high temperatures
• Enlarged cooling passage around the exhaust seats
• S&S exclusive breather boxes

CRANKCASE

• All premium quality components
• Patented dual-spray piston cooling jets
• Precision-machined oil scraper
• Enlarged oil sump
• A contoured floor allows oil to easily drain back to the sump

DISCLAIMER

For closed course competition use only. Not intended for street use. Legal in California only for racing vehicles that may never be used, registered, or licensed for use on a highway. Not legal for sale or use nationwide on any federal pollution-controlled motor vehicle under the Clean Air Act.

Not legal for sale or use in California on any pollution-controlled motor vehicle *Qualified manufacturer declared 49-state federal emissions compliant engine in 2018-2020 Softail models (Except Fat Bob, FXDR and Sport Glide)

Does not work with VVT (Variable Valve Timing) or HELIX