The 12 valve 5.9L Cummins engine is one of the most reliable and desirable engines ever put into a pickup truck. It is also one of the most popular engines for building big power. Overtime, just like any engine, cylinder heads can fail and need replacing. Give new life to your 12 valve 5.9L Cummins with a brand new Freedom Series Streed HD cylinder head. Each head starts life as a brand new casting and features hardened, oversized press-in valve seats, heavy duty 160lb valve springs, new valves and top hat valve seals, and no core charge. This head is perfect for your daily driver or heavy duty towing applications. Head gasket not included.