Introducing the next generation of Proven Performance for your 2017 & newer H-D Touring Models, the MK136 Engine.This is the newest version of the complete crate engines S&S is known for, ready to install in your M8 Touring bike. S&S 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 huge displacement engine is sure to not only create huge power, but also put a huge smile on your face when you lay into the throttle. It is the purchaser's responsibility to consider the suitability for their application. Engine noise and damage from abuse is not covered under warranty.