Dieselr Billet Coolant Block-Off Plate Duramax LB7/LLY/LBZ/LMM/LML/L5P 6.6L (2001-2026)

Billet Coolant Block-Off Plate for 6.6L Duramax

The Dieselr Billet Coolant Block-Off Plate Duramax LB7/LLY/LBZ/LMM/LML/L5P 6.6L (2001-2026) is a precision-machined solution designed to properly seal unused coolant ports on 6.6L Duramax platforms. Engineered for platform-specific fitment, this component provides a controlled and leak-resistant closure point within modified or reconfigured cooling systems.

Built from billet material for durability and consistent sealing pressure, it maintains system integrity without introducing unnecessary complexity.

Platform Fitment

• 2001-2004 GM 6.6L Duramax LB7
• 2004.5-2005 GM 6.6L Duramax LLY
• 2006-2007 GM 6.6L Duramax LBZ
• 2007.5-2010 GM 6.6L Duramax LMM
• 2011-2016 GM 6.6L Duramax LML
• 2017-2026 GM 6.6L Duramax L5P
• Chevrolet Silverado 2500HD / 3500HD
• GMC Sierra 2500HD / 3500HD

Confirm engine code and application prior to ordering to ensure proper fitment.

Engineering Overview

Billet Construction

Machined from solid billet material to resist corrosion, heat cycling, and long-term coolant exposure.

Secure Sealing Surface

Designed to provide even clamping force and consistent gasket or O-ring engagement where applicable.

Platform-Correct Dimensions

Manufactured specifically for 6.6L Duramax coolant port geometry across supported generations.

Installation Notes

• Intended for use in modified or reconfigured cooling system applications
• Verify sealing surface condition prior to installation
• No tuning or calibration changes required

Installer is responsible for confirming correct application and proper torque procedure.

Support

Dieselr selects components that maintain structural and thermal integrity across Duramax platforms. Confirm full cooling system configuration before proceeding.

Built to work the way it should.