Duramax LLY / LBZ Valve Cover Gasket 2004-2007 Dorman 904-171

Dorman valve cover gasket set for the Duramax LLY / LBZ (2004-2007). Listed for one application: Duramax LLY / LBZ engines, 2004-2007, in Chevrolet, GMC applications. Confirm your engine code and year against this listing before ordering.

What it does

Valve cover gaskets seal the valvetrain oil under the covers. Hardened gaskets leak onto the exhaust manifolds and into spark plug wells, where oil kills coils and plugs. A fresh set (with plug-well seals where the engine uses them) stops the leak.

Fits

• Chevrolet vehicles with the Duramax LLY / LBZ engine, 2004-2007
• GMC vehicles with the Duramax LLY / LBZ engine, 2004-2007

Fixes

• oil on the exhaust manifold or a burning-oil smell
• oil in the spark plug tubes
• a coil or plug job where the covers are off

What's included

• valve cover gaskets for both banks
• spark plug tube seals and grommets where listed

Specifications

• Brand: Dorman
• Part number: 904-171
• Shipping weight: 1.0 lb
• Condition: new
• Product type: Valve Cover Gasket

Cross-reference

Replaces or interchanges with Dorman 904-171 for the Duramax LLY / LBZ. Check the part number stamped on your original before ordering.

Free shipping on orders of $70 or more; everything else ships with calculated shipping at the part's real weight. Questions on fitment? Ask a tech before you buy.