S&S Cycle #310-1290 - MK136 Black Edition Engine - Oil Cooled - 49 State - M8 Touring

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

NOTE: The warranty for our MK136 engines is one year parts only

Fitment

Year(s)	Make	Model Code	Model
2017-2028	Harley-Davidson	—	M8 Touring