2001–2004 LB7 Duramax 6.6L Stock Remanufactured Cylinder Heads with Torque Lock Injector Cups

Restore factory performance and long-term reliability to your 2001–2004 LB7 Duramax 6.6L with these stock remanufactured cylinder heads, professionally upgraded with Torque Lock injector cups to permanently address one of the LB7’s most common failure points—injector cup movement and coolant intrusion.

Designed as a direct bolt-on replacement, these remanufactured Duramax heads are rebuilt to OE specifications, thoroughly inspected, pressure tested, and precision machined to deliver dependable performance for stock rebuilds or mild performance applications. Whether you’re replacing failed heads or performing a preventative upgrade, these heads provide a proven solution for long-term durability.

Key Features

• Stock remanufactured LB7 Duramax cylinder heads

• Upgraded with Torque Lock injector cups for superior sealing and retention

• Eliminates common LB7 injector cup failure and coolant intrusion issues

• Fully cleaned, pressure tested, and resurfaced

• Diamond honed valve guides

• Unshrouded valves for improved airflow

• High-strength, heat-treated iron-based valve guides

• Premium nickel-based, non-magnetic valve seat inserts

• Multi-angle valve job

• New valve springs installed

• Assembled and ready for installation

• Ideal for stock replacement or mild performance builds

Torque Lock Injector Cup Upgrade

Unlike factory press-in injector cups or aftermarket cupless head castings, Torque Lock injector cups are mechanically locked in place to prevent movement under high heat and pressure. This design significantly reduces the risk of injector leaks, combustion gas intrusion, and coolant contamination—making these heads a superior upgrade over standard remanufactured LB7 heads.

What’s Included

• Left and right remanufactured LB7 cylinder heads

• Pre-installed Torque Lock injector cups

• Fully assembled and ready to install

Not Included:
Gaskets, head bolts, injectors, or installation hardware

Vehicle Fitment

• 2001–2004 GM Duramax LB7 6.6L

• Chevrolet Silverado 2500HD / 3500HD

• GMC Sierra 2500HD / 3500HD

Why Choose These LB7 Reman Heads?

• OE-style performance with modern reliability upgrades

• Proven solution for LB7 injector cup failures

• Ideal for cylinder head replacement or preventative upgrades

• Professionally remanufactured and quality-checked

• Built for long-term durability and peace of mind

Core Return Information

Sold as a matched left and right pair.

To receive full core credit, a good, reusable pair of LB7 cylinder heads must be returned. Cores must be free of cracks, excessive warping, or severe damage. Core returns are required within 90 days of purchase.