Introducing the all-new, Fleece Performance Freedom Series HD cylinder heads for the 2003-2007 6.0L Ford Power Stroke. Each cylinder head is manufactured in our state-of-the-art Freedom Racing Engine shop and is guaranteed to meet or exceed factory specifications. Our HD cylinder heads are built on a brand-new casting that has been engineered from the ground up for increased durability and longevity. Fully assembled and ready to install - all heads are equipped with hardened, oversized press-in valve seats, new valve guides, springs, valves, and valve seals. Standard with our one-piece O-rings in the head to ensure maximum cylinder sealing. Perfect for a daily driver or heavy-duty towing application where reliability and uptime are a must. Features: Brand-new, higher tensile strength casting Race-proven formula with hardened, oversized press-in valve seats provides maximum durability and longevity Fleece Performance exclusive single-piece O-ring design ensures complete combustion sealing vs. traditional stainless wire that must be seamed. New valvetrain including Stainless Steel / Inconel alloy valves, springs, retainers, and keepers No core charge or core to return. 

• Re-manufactured OE casting