5.9 Cummins Cylinder Heads

The three 5.9L generations use different cylinder head designs due to valve configuration, injector bore location, and combustion chamber geometry changes. They are not interchangeable — confirm your engine generation before ordering.

Head gasket failure on the 24V is most common in high-boost applications and engines that have seen overheating events. O-ringed heads with quality studs and MLS gaskets are the proven solution for performance and high-mileage rebuilds.

Head gasket failure on the CR 5.9L is primarily a performance and high-boost concern rather than a stock-power issue. Builds running large injectors, compound turbos, or aggressive tunes benefit significantly from o-ringed heads and upgraded studs.