POWERSTROKE PRODUCTS PP-18MMLHDVSO 18MM 6.0L LOADED O-RING CYLINDER HEAD W/ HD SPRINGS

POWERSTROKE PRODUCTS PP-18MMLHDVSO, 6.0 POWERSTROKE 18MM O-RING CYLINDER HEAD, 6.0L LOADED HEAD WITH HD SPRINGS, FORD 6.0 POWERSTROKE CYLINDER HEAD UPGRADE, CPP DIESEL POWERSTROKE PRODUCTS HEADS. 6.0 POWERSTROKE 18MM LOADED O-RING HEAD, PERFORMANCE CYLINDER HEAD FOR TUNED 6.0L, POWERSTROKE PRODUCTS LOADED 6.0L HEAD, DIESEL PERFORMANCE CYLINDER HEAD 18MM DOWELS.

Overview

The POWERSTROKE PRODUCTS PP-18MMLHDVSO 18MM 6.0L LOADED O-RING CYLINDER HEAD W/ HD SPRINGS is built from a brand-new casting and assembled with all-new valves, heavy duty springs, and seals. Machined O-rings around the combustion chambers help keep combustion pressure sealed inside the cylinders and out of the cooling system, making this one of the best upgrades for a performance-built 2003–2005 6.0L Powerstroke that you only want to tear down once.

This loaded 18mm head is ideal for trucks running upgraded turbos, larger injectors, aggressive tuning, towing-heavy duty cycles, or competition use. The heavy duty valve springs provide better valve control at higher RPM and under elevated cylinder pressures, while the O-ringed fire ring design works with a quality multi-layer steel (MLS) gasket and head studs to significantly improve sealing compared to stock-style heads.

Pair this head with the correct POWERSTROKE PRODUCTS PP-CAMPKG6.0 CAM PACKAGE, head gasket set, and head studs and you’ll have a top-end package that is ready for serious power while maintaining long-term reliability.

Key Features

• Brand-new cylinder head casting – no re-man core
• Loaded assembly: new valves, heavy duty valve springs, and seals installed
• Machined O-rings around combustion chambers for superior sealing
• Designed specifically for 18mm head dowel 6.0L Powerstroke blocks
• Perfect match for tuned, towing, or performance-built 6.0L applications
• Sold individually (order two for a complete engine)
• Backed by a 1-year unlimited mileage manufacturer warranty

Fitment

This head fits early 6.0L Powerstroke engines equipped with 18mm head dowels. Model years below are typical guidelines – always verify dowel size on your specific engine before ordering.

• 2003–2005 Ford F-250 / F-350 / F-450 / F-550 Super Duty – 6.0L Powerstroke (18mm dowel block)
• 2003–2005 Ford Excursion – 6.0L Powerstroke (18mm dowel block)

Not for 20mm-dowel 2005.5–2007 engines. For those trucks, see the 20mm Powerstroke Products heads.

Recommended Supporting Parts (Sold Separately)

• POWERSTROKE PRODUCTS PP-18MMLOEM 18MM 6.0L HEAD LOADED OEM – ideal for near-stock builds.
• POWERSTROKE PRODUCTS PP-18MMLHDVS 18MM 6.0L HEAD LOADED HD VALVE SPRINGS – non O-ringed HD-spring head option.
• POWERSTROKE PRODUCTS PP-CAMPKG6.0 6.0 CAM PACKAGE (INCLUDES CAM, SPRINGS, PUSHRODS, LIFTERS) – complete cam-swap hard-parts kit to complement this head.

Installation Notes

• Confirm 18mm head dowel size before ordering or installing.
• Use with a quality MLS head gasket designed for O-ringed heads (Powerstroke Products 18mm gasket set recommended).
• Do not use Fel-Pro head gaskets with O-ringed heads; this can cause sealing issues and may void warranty.
• Head studs are strongly recommended on any tuned, towing, or performance application.
• Professional installation and proper torque/sequence procedures are strongly recommended.

Cross-Reference / Alternatives (POWERSTROKE PRODUCTS Only)

• PP-18MMLOEM – 18MM 6.0L Head Loaded OEM
• PP-18MMLHDVS – 18MM 6.0L Head Loaded HD Valve Springs
• PP-CAMPKG6.0 – 6.0 Cam Package (Includes Cam, Springs, Pushrods, Lifters)

California & Prop 65

This product may be subject to shipping restrictions in certain states and carries a Prop 65 warning. Always review local regulations before ordering for emissions-controlled vehicles.

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

Specifications

Specifications for POWERSTROKE PRODUCTS PP-18MMLHDVSO

FAQ

This loaded O-ring cylinder head is intended for 2003–2005 6.0L Powerstroke trucks with 18mm head dowels, including most F-250, F-350, F-450, F-550 Super Duty and Excursion models. Always verify dowel size on your specific engine before ordering.

Early 6.0L engines typically use 18mm dowels and later engines use 20mm dowels, but model year alone is not a guarantee. The dowel size can be measured once the head is removed or verified using trusted build-date and VIN information. If you are unsure, consult a trusted diesel shop before ordering.

Use a high-quality MLS head gasket designed for 18mm 6.0L applications and compatible with O-ringed heads. Powerstroke Products’ 18mm head gasket set (PP-HGS-6.0/18) is recommended. Do not use Fel-Pro head gaskets with O-ringed heads, as they are not compatible and may cause sealing issues or void warranty.

While technically possible to install with factory head bolts, head studs are strongly recommended for any tuned, towing, or performance use. A quality head stud kit helps keep the head clamped under high cylinder pressure and maximizes the benefit of the O-ringed sealing surface.

This POWERSTROKE PRODUCTS head is built from a brand-new casting that is inspected and machined before being assembled with new valves, heavy duty springs, and seals. It is not a reman core head.