3925400 | Cummins 6BT 12V 5.9L Loaded Complete Reinforced New Cylinder Head

New Cummins 6BT 12V 5.9L Casting 3925400 Loaded Complete Reinforced Cylinder Head

Premium Heavy-Duty Reinforced Replacement Cylinder Head

This premium, fully loaded cylinder head is engineered specifically for Cummins 6BT 12V 5.9L diesel engines. It features a brand-new, reinforced casting designed to eliminate common cracking issues and restore optimal performance. Fully assembled and ready to install right out of the box, it provides maximum durability for demanding heavy-duty applications.

🛠️ In-House Machining Process

• Debris-Free Preparation: Every new casting is chemically cleaned and blown out to remove all residual machining oils and manufacturing debris. This ensures your engine’s 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.
• 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 system.
• Dimensional Inspection: Our technicians perform a multi-point inspection of the gasket-sealing surface. 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. Each head comes fully assembled with valves and springs, ready for a direct bolt-on installation.
• 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 right out of the box.

📊 Technical Specifications

• Engine Size: 5.9L (6-Cylinder)
• Engine Type: Diesel
• Casting Number: 3925400
• Condition: New
• Core Return Required

🚘 Common Applications

Direct fit for Cummins 5.9L 12V 6BT engines found in:

• Years: 1989–1998
• Fitment: Fits all 1989-1998 12-Valve 5.9L motors, including Dodge Ram 2500, Ram 3500, and more.
• Vehicle & Equipment Types: Light/Heavy Duty Trucks, Industrial Machinery, and Marine Applications