New Chevrolet GM Duramax 6.6 Diesel Cylinder Head LB7 2001-2004.5 | No Core Required

New Chevrolet GM Duramax 6.6L LB7 Diesel Cylinder Head (2001–2004.5)

Premium OEM-Quality Replacement with Pre-Installed Injector Sleeves

Restore your engine’s mechanical integrity with this all-new LB7 Duramax 6.6L cylinder head, specifically engineered for 2001–2004.5 Chevrolet Silverado and GMC Sierra 2500HD/3500HD applications. This fresh, high-density casting features pre-installed and vacuum-tested injector sleeves, ensuring a leak-proof seal under extreme thermal loads. Although the gasket surface is pre-milled, every unit undergoes an in-house precision verification to ensure the Surface Roughness (Ra) meets the strict requirements for high-clamping Multi-Layer Steel (MLS) gaskets. We perform final guide sizing and multi-angle valve seat cutting on our Rottler equipment to ensure perfect valvetrain geometry and a 100% airtight seal. Pressure tested to 60 PSI and built to withstand the high-injection pressures of the LB7 platform, this head provides a professional-grade solution for long-term cooling system and combustion integrity.

🛠️ 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

• Engine Size: 6.6L V8 Turbo Diesel
• Engine Code: LB7 (VIN 8th Digit “1”)
• Condition: New Aftermarket
• Years: 2001–2004.5
• Components Included: Pre-installed injector sleeves and high-quality valve seals
• Each Cylinder Head Includes: Valves and Springs Installed

🚛 Fitment Data

Common Applications:

• GMC Sierra 2500 Pickup: 2001–2001 GMC Sierra 2500 Pickup (6.6L)
• GMC Sierra 2500 Pickup: 2002–2003 GMC Sierra 2500 Pickup (6.6L Federal emissions opt NF2)
• GMC Sierra 2500 Pickup: 2004–2004 GMC Sierra 2500 Pickup (6.6L VIN 1 8th digit Federal emissions opt NF2)
• GMC Sierra 3500 Pickup: 2001–2001 GMC Sierra 3500 Pickup (6.6L)
• GMC Sierra 3500 Pickup: 2002–2003 GMC Sierra 3500 Pickup (6.6L Federal emissions opt NF2)
• GMC Sierra 3500 Pickup: 2004–2004 GMC Sierra 3500 Pickup (6.6L VIN 1 8th digit Federal emissions opt NF2)
• Chevrolet Silverado 2500 Pickup: 2001–2001 Chevrolet Silverado 2500 Pickup (6.6L)
• Chevrolet Silverado 2500 Pickup: 2002–2003 Chevrolet Silverado 2500 Pickup (6.6L Federal emissions opt NF2)
• Chevrolet Silverado 2500 Pickup: 2004–2004 Chevrolet Silverado 2500 Pickup (6.6L VIN 1 8th digit Federal emissions opt NF2)
• Chevrolet Silverado 3500 Pickup: 2001–2001 Chevrolet Silverado 3500 Pickup (6.6L)
• Chevrolet Silverado 3500 Pickup: 2002–2003 Chevrolet Silverado 3500 Pickup (6.6L Federal emissions opt NF2)
• Chevrolet Silverado 3500 Pickup: 2004–2004 Chevrolet Silverado 3500 Pickup (6.6L VIN 1 8th digit Federal emissions opt NF2)