Upper Valve Cover Gasket

Merchant 97312341 Upper Valve Cover Gasket | 2004.5–2010 GM 6.6L Duramax 2500HD/3500HD

Restore a Leak-Free Seal on Your Duramax
The Merchant 97312341 Upper Valve Cover Gasket is a direct-fit replacement designed for 2004.5–2010 GM 6.6L Duramax diesel engines. If you’re experiencing oil seepage, smoke, or buildup around your valve cover area, this premium gasket is a must-have for restoring a tight seal and preventing future oil leaks. Manufactured to OEM specifications, this gasket is perfect for routine maintenance, valve cover removal, or full engine service.

Key Features:

• Precision-molded to match factory dimensions for a secure fit

• High-quality materials resist oil saturation and high-temperature exposure

• Seals the upper valve cover to the cylinder head to prevent oil leaks

• Compatible with both LLY, LBZ, and LMM Duramax engine variants

• Ideal for maintenance, repairs, or full valve cover gasket replacement

Built to Withstand Diesel Demands
Diesel engines like the 6.6L Duramax run hotter and under more stress than gas engines, so a quality valve cover gasket is critical to keep oil contained and your engine bay clean. Merchant Automotive uses materials that stand up to the heat, vibration, and pressure of diesel power, ensuring long-lasting reliability even in towing and performance applications.

Installation Made Easy
This gasket installs in the factory location with no special tools required. It’s a perfect fit for the upper valve cover and can be installed during head work or gasket service. Always recommended when servicing injectors or inspecting rocker arms.

Fitment: 2004.5, 2005, 2006, 2007, 2008, 2009, 2010 GM 6.6L Duramax 2500HD/3500HD (LLY, LBZ, LMM)

Warranty: Backed by Merchant Automotive's standard product warranty.

Fitment Notes: Designed specifically for the upper valve cover on LLY, LBZ, and LMM Duramax engines. Not intended for earlier LB7 or later LML applications.