
- Improved Casting: Engineered from the ground up, this brand-new, higher tensile strength alloy casting features greater wall thickness and additional material in high-stress areas for a more durable and longer-lasting product.
- Extreme-Duty Valve Seats: These American-made, race-proven seats are manufactured from a tungsten alloy for superior hardness and substantially higher wear resistance compared to factory units, offering unmatched longevity and stability. They are also hardened and oversized press-in for maximum durability.
- Single-Piece O-Ring: Fleece's exclusive single-piece hoop-style O-ring design ensures a complete and continuous seal of combustion, outperforming traditional seamed stainless wire.
- Ready-to-Install Assembly: Each head includes an all-new valvetrain featuring Stainless Steel and Inconel alloy valves, springs, retainers, and keepers, along with new valve guides and valve seals.
- Direct-Fit and Simple: This is a direct-fit replacement that meets or exceeds factory specifications, and Fleece eliminates the hassle with No Core Charge or Core To Return.
- Peace of Mind: Backed by a 1-Year Limited Manufacturer Warranty.
- Head gasket not included. Fleece recommends the use of Ford Head Gaskets.
- All 18mm dowel heads are configured for use on 8-bolt rocker box configurations.
- If your engine serial number is 6,000,000 to 6,723,721 (or 1 to 299,092) you need 18mm cylinder heads.
- All 18mm heads are configured for use with early style injector clamps with a T40 fastener - Ford 3C3Z-9C995-AA Fuel Injector Hold Down Clamp.
- Fleece Performance recommends the use of Ford 8C3Z-6565-B Replacement Pushrod when installing this cylinder head. The 6.4L pushrods are 0.050" shorter in length than the 6.0L pushrod and will accommodate the tolerance stack-ups that can be encountered with a replacement cylinder head.

Don't let a warped cylinder head sideline your Ford 6.0L Powerstroke (2003-2006 with 18MM Dowels). The Fleece Freedom Series HD 18mm 6.0L Cylinder Head (FPE-61-10011-HD) is not just a replacement; it's a critical upgrade engineered for superior longevity and relentless reliability. Manufactured within Fleece's cutting-edge Freedom Racing Engine shop, this head is a testament to meticulous engineering. It starts with a brand-new casting that dramatically improves upon the original design by using a higher tensile strength alloy, incorporating greater wall thickness, and adding material where it's needed most. This results in a cylinder head built to withstand the stresses of heavy-duty towing and the demands of a daily driver, making downtime a thing of the past. It comes fully assembled and ready to install—no core charge or return required—and features a host of premium, race-proven components, including a one-piece O-ring design for maximum cylinder sealing.
Improved Casting: Engineered from the ground up, this brand-new, higher tensile strength alloy casting features greater wall thickness and additional material in high-stress areas for a more durable and longer-[...]
- Improved Casting: Engineered from the ground up, this brand-new, higher tensile strength alloy casting features greater wall thickness and additional material in high-stress areas for a more durable and longer-lasting product.
- Extreme-Duty Valve Seats: These American-made, race-proven seats are manufactured from a tungsten alloy for superior hardness and substantially higher wear resistance compared to factory units, offering unmatched longevity and stability. They are also hardened and oversized press-in for maximum durability.
- Single-Piece O-Ring: Fleece's exclusive single-piece hoop-style O-ring design ensures a complete and continuous seal of combustion, outperforming traditional seamed stainless wire.
- Ready-to-Install Assembly: Each head includes an all-new valvetrain featuring Stainless Steel and Inconel alloy valves, springs, retainers, and keepers, along with new valve guides and valve seals.
- Direct-Fit and Simple: This is a direct-fit replacement that meets or exceeds factory specifications, and Fleece eliminates the hassle with No Core Charge or Core To Return.
- Peace of Mind: Backed by a 1-Year Limited Manufacturer Warranty.
- Head gasket not included. Fleece recommends the use of Ford Head Gaskets.
- All 18mm dowel heads are configured for use on 8-bolt rocker box configurations.
- If your engine serial number is 6,000,000 to 6,723,721 (or 1 to 299,092) you need 18mm cylinder heads.
- All 18mm heads are configured for use with early style injector clamps with a T40 fastener - Ford 3C3Z-9C995-AA Fuel Injector Hold Down Clamp.
- Fleece Performance recommends the use of Ford 8C3Z-6565-B Replacement Pushrod when installing this cylinder head. The 6.4L pushrods are 0.050" shorter in length than the 6.0L pushrod and will accommodate the tolerance stack-ups that can be encountered with a replacement cylinder head.