KDD is proud to present our exclusive line of Jesel rocker arms for the 6.6L GM Duramax.  We had the honor of working with the world renowned valvetrain innovation experts at Jesel to develop the best rocker arms on the planet for the Duramax.  

Engineered excellence. That’s what we consider the Jesel Pro Steel Shaft Rockers to be. Engineered to handle the immense cylinder pressures of a 3000hp Pro Mod engine and strong enough to endure a grueling 24 hour road race with miles to spare. Through extensive engineering and FEA analysis, Jesel has designed a steel bodied rocker with less deflection and better moment of inertia than similar aluminum rockers. These advancements allow engine builders the opportunity to develop a more aggressive cam profile by utilizing a more stable valve train package. 

Jesel Pro Steel Rockers are ideal for engines equipped with turbos, superchargers or nitrous where excessive exhaust cylinder pressures surpass the limits of a factory or aluminum rocker. Also, any type of endurance racing such as oval / road racing or marine use would highly benefit from the fatigue resistance of a steel rocker arm and they are durable enough to handle years of reliable service in your daily driver.

CNC machined from a 4340 forging, the heat treated bodies are surface coated to resist rust and corrosion. A needle bearing valve tip roller along with a full compliment needle shaft bearing with thrust washers eliminates friction robbing horsepower and ensures smooth movement throughout the lift cycle. The rockers can be fitted with either our tool steel cup or ball lash adjusters for high lift applications. 

These rockers work with factory style rocker shafts, and factory style pushrods.