18mm 6.0L Head Loaded HDS Oringed

6.0L Powerstroke Loaded O-Ringed Cylinder Head w/ HD Valve Springs – 18mm Dowels (2003–2005)
Part #: PP-18MMLHDVSO

Build your 2003–2005 Ford 6.0L Powerstroke for performance and durability with the Powerstroke Products Loaded O-Ringed Cylinder Head with Heavy Duty Valve Springs. Designed to handle increased boost and aggressive tuning, this cylinder head features a machined O-ringed combustion surface to keep compression sealed in the cylinder and out of your cooling system—ideal for high-horsepower or towing applications.

Each head begins with a brand-new casting, then is fully assembled with new valves, seals, and 100lb heavy-duty valve springs. The upgraded springs improve valvetrain control under pressure and RPM, helping you get the most out of your modified Powerstroke.

✅ Features:

• Built for 18mm dowel 6.0L Powerstroke engines

• Brand-new casting – no remanufactured parts or core required

• Machined for O-rings – enhanced head gasket sealing under boost

• Fully assembled with new valves, seals, and HD valve springs

• Ideal for performance builds, towing, and tuned trucks

• 1-Year / Unlimited Mileage Warranty

• Sold individually – order 2 for both heads

🔧 Fitment:

• Fits 2003–2005 Ford F-250, F-350, F-450, and Excursion with 6.0L Powerstroke

• Model year ranges are suggested—please confirm dowel size before ordering

⚠️ Notes:

• MLS head gaskets only must be used with O-ringed heads

• Hot re-torque is required to maintain warranty

• Head studs sold separately – full selection available

• Not for sale or use in the state of California

The PP-18MMLHDVSO Loaded O-Ringed Head is a proven solution for serious 6.0L builds demanding stronger sealing, better valvetrain control, and ready-to-install reliability.