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 136in. cylinders and flywheels, and then fit High-flow cylinder heads with +1mm Valves and .605in. springs. This is everything you need to have the largest, most powerful, and most reliable crate engine on the market today.

Features & Benefits:-

Cylinder Heads:-

* High-flow cylinder heads with premium seats, guides, valves, springs, and seals.

+1mm oversized intake and exhaust valves

* Valves are .030in. longer than stock for improved valvetrain geometry

* .605in. 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 Exclusivebreather boxes

Crankcase:-

* All premium quality components

* Patented Dual-Spray Piston Cooling Jets

* O-ring sealing between case and cam support plate

* Precision machined oil scraper

* Enlarged oil sump

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

MK136 Engine:-

* Forged pistons 11:1 compression

* S&S 550 Gear Drive Cam

* 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

* 1 Year Warranty

Proudly Made in the USA by S&S Cycle !