S&S Cycle #310-1296 - MK136 Engine - 475G Camshaft - Oil Cooled - M8 Softail

Introducing the next generation of Proven Performance for your 2018-2024 H-D® Softail® Models, the MK136B Engine . This is the newest version of the complete crate engines S&S is known for, ready to install in your M8 Softail. We took our MKB-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.
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
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


MK136B

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

Fitment

Year(s)	Make	Model Code	Model
2018-2020	Harley-Davidson	—	M8 Softail