Replacement heads for my 3.5 EcoBoost worked perfect. The kit had everything I needed. The customer service was excellent. Highly recommend this company.
Best prices and customer service on Duramax LML heads out there. Shipped fast and very cool about how long it took to get the cores back.
Great company!! The heads arrived in great shape with all the parts. Very quick email responses to questions, comments, and concerns. One little issue with a few parts but was taken care of promply
Part came in and work as a champ. Price was better than all other places I look for the set. Will recommended to all my soldiers and/or buddies if they need cylinder heads replace. Thank you guys.
3925400 | Cummins 6BT 12V 5.9L Loaded Complete Reinforced New Cylinder Head
$995.00
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Additional Info
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
📦 Core Return & Warranty
- Core Process: No upfront core fee. Receive your new head and compare it to your original before installation. Once complete, use the pre-paid return label included in your shipment. Cores must be returned within 30 days. Click here for Core Policy.
- Warranty: Includes a 2-Year Warranty covering defects in materials and workmanship. Click here for Warranty details.
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