Meet the MHP 135 Devil Runner – Moonshine Horsepower’s 135 Cubic Inch M8 Engine Build, crafted for riders chasing max performance with unrelenting grit. We crank up the power with oversized 4.375″ MHP Monster Cylinders and a rugged 4.500″ stroke, positioning the piston higher at bottom dead center for less flex and strain on the cylinder spigots. This beast demands precision-bored engine cases to accommodate our massive cylinders, featuring centrifugally cast ductile iron sleeves from Darton Sleeves and longer spigots for rock-solid piston stability. The larger bore unshrouds the intake valves for superior airflow, while our MHP Monster Heads with oversized +2.5mm intake valves and square ports unleash ferocious flow. Teamed with our Monster CNC intake manifold, the MHP 135 Devil Runner delivers dominating power for the everyday rider.

Explore our dyno sheets below to pick the camshaft and exhaust setup that matches your ride – untamed performance for every road.