New Pair Ford 6.0 Turbo Diesel 18mm O-Ring Cylinder Heads Performance Stage III

New Pair Ford 6.0L Powerstroke 18mm Casting Turbo Diesel Cylinder Heads – O-Ring Upgrade with Performance Springs, Valves, and Pushrods

Premium O-Ring Upgrade with High-Performance Components for Maximum Durability

Restore your engine’s mechanical integrity with this pair of all-new 18mm O-ringed 6.0L Powerstroke cylinder heads, specifically engineered for 2003–2006 Ford Super Duty and Excursion applications. These fresh, high-density castings feature a precision-machined O-ring upgrade, utilizing a stainless steel wire to create a secondary mechanical seal that bites into the head gasket—drastically reducing the risk of combustion leaks under the extreme cylinder pressures of tuned and heavy-tow diesel environments. This performance package is fully loaded with nitride-treated valves for superior heat resistance and high-pressure springs to prevent valve float, complemented by corrected-length chromoly pushrods to optimize valvetrain geometry. Although the gasket surfaces are pre-milled, every unit undergoes an in-house precision verification to ensure the Surface Roughness (Ra) meets the strict requirements for modern MLS gaskets. We perform final guide sizing and multi-angle valve seat cutting on our Rottler equipment to ensure perfect geometry and a 100% airtight seal. Pressure tested to 60 PSI, this package provides a professional-grade solution for ‘bulletproof’ reliability.

🛠️ In-House Machining Process

• Debris-Free Preparation: Every new casting is chemically cleaned and blown out to remove all residual machining oils, metal shavings, and manufacturing debris. This ensures your oiling system remains uncontaminated from the first start-up.

• In-House Precision Machining: Unlike “shelf-stock” heads, we perform all final machine work in-house. This includes final guide sizing and precision valve seat cutting to ensure perfect geometry and clearances before the head reaches the assembly bench.

• Pressure & Integrity Testing: To go beyond the factory standard, we pressure-test every head to 60 PSI. This verifies that the casting is free of porosity leaks or internal defects that could compromise the cooling or oiling systems.

• Dimensional Inspection: Our technicians perform a multi-point inspection of the gasket-sealing surface and bore alignment. This ensures the head is perfectly flat and meets tight OEM tolerances for a flawless fit.

• Professional Assembly & Setup: Valvetrain components are installed and verified in a clean-room environment. We check spring heights and seal seating to ensure the assembly is balanced and ready for high-performance use.

• Vacuum-Seal Verification: Every intake and exhaust port is Vacuum Tested. This guarantees a 100% airtight seal between the valves and seats, ensuring maximum compression and peak performance right out of the box.

📊 Technical Specifications

• Condition: Brand New
• Quantity: Pair (Two Heads)
• Engine Size: 6.0L V8 Turbo Diesel
• Dowel Size: 18mm
• Material: Heavy-Duty Casting
• Valves: Performance Nitrided Stainless Steel (EV8 Intake / EV16 Exhaust)
• Pushrods: One-Piece Chromoly Steel (.080″ Wall Thickness)
• Body Diameter: .344″
• Length: 9.795″
• Interchange Part Numbers: ELGIN PR642, PR662; FORD 8C3Z6565B; NAVISTAR 1873916C2
• Features: O-Ring Seal Upgrade, Polished Stems, Hardened Tips
• Each Cylinder Head Includes: Valves and Springs Installed
• Additional Hardware: Performance Pushrods

🚛 Fitment Data

Common Applications:

• Ford Excursion: 2003–2005 Ford Excursion (6.0L Diesel)
• Ford E-350 Van: 2004 Ford E-350 Van (6.0L Diesel)
• Ford F-250 Super Duty: 2003–2005 Ford F-250 Super Duty (6.0L Diesel)
• Ford F-350 Super Duty: 2003–2005 Ford F-350 Super Duty (6.0L Diesel)
• Ford F-450 Super Duty: 2003 Ford F-450 Super Duty (6.0L Diesel)
• Ford F-550 Super Duty: 2003 Ford F-550 Super Duty (6.0L Diesel)