These aluminum heads come complete and ready to run straight out of the box and are designed to fit all variations of the Duramax engine that was offered in the popular Silverado and Sierra pickup truck as well as Chevrolet and GMC 2500/3500 HD trucks between 2001 and 2016. Edelbrock’s new Diesel Cylinder Heads are compatible with all stock Duramax valvetrain components as well as valve covers, water crossover, injectors and plugs. Each A356 aluminum cylinder head casting is heat- and pressure-treated to reduce porosity while also increasing both strength and fatigue properties. Intake and exhaust runners are designed to optimize flow and swirl, but engine builders and head porters will also appreciate the extra deck and port wall material for custom porting and deck strength. Best of all, the new Edelbrock Diesel Cylinder Heads are CARB legal, making them the perfect choice for a street performance upgrade to your Chevy or GMC Duramax Diesel engine.