Performance cylinder heads enhance the airflow into your engine, giving you improved power and torque. Bolt on a set of fully assembled cylinder heads for instant power gains or custom build your engine’s top-end around a set of bare castings!

Our cylinder heads are sold exclusively through Fleece Performance Engineering as well as wholesalers and dealers nationwide. From the Freedom Freedom Racing Engine shop comes a new cylinder head option for the 6.6L Duramax! The lineup includes cylinder heads for all models of the Duramax, from 2001-2016.

Here's what cylinder heads do: Combustion Chamber: Cylinder heads enclose the combustion chamber where air and fuel mix and ignite, generating power to drive the engine. Valve Operation: They house the intake and exhaust valves, controlling the flow of air and exhaust gases in and out of the cylinders.

When properly matched to a performance camshaft, a lot of horsepower can be gained. JEGS offers performance cylinder heads for Chevy, Dodge, Jeep, Chrysler, Ford, and custom applications from top manufacturers such as Edelbrock cylinder heads, ATK cylinder heads, ProMaxx cylinder heads, JEGS cylinder heads, and others.