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Show your support with a Thoroughbred Diesel t-shirt, sweatshirt, or sticker decal.
Thoroughbred Sku #: PSPPP-18MMLHDVSO Manufacturer Sku #: PP-18mmLHDVSO
Year/Make/Model: {{year}} {{make.Name}} {{model.Name}} Edit
$1,560.00
2003 - 2005 Ford Excursion
2003 - 2005 Ford F450
2003 - 2006 Ford F250
2003 - 2006 Ford F350
Product Name: Powerstroke Products 18mm Head Loaded HDS Oringed Manufacturer: Powerstroke Products Manufacturer Part #: PSPPP-18MMLHDVSO Thoroughbred Diesel Part #: PP-18MMLHDVSO Fitment Notes: 2003-2005 Ford F-250/F-350/F-450 | Excursion 6.0L Powerstroke
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.
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
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
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.