MK136 Black Edition Engine With 550G Cam for Oil-Cooled 2017-2023 M8 Touring

Manufacturer:  S&S Cycle
S&S Cycle Part Number:  310-1289

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
• Contoured floor allows oil to easily drain back to the sump

MK136

• Forged pistons
• 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
• Powder coat finish matches factory finish
• Huge displacement increase means a huge power increase