2004.5-2005 GM Duramax 6.6L LLY Gaskets

If you're looking to re-seal the cylinder head and upper engine in your 2004.5-2005 GM 6.6L Duramax LLY, we have you covered. Here at Alligator Performance, we only work with trusted and reliable brands so you can have a boost of confidence each time you get behind the wheel of your Sierra/Silverado 2500/3500. Each head gasket and gasket set we carry was built to either meet or exceed OEM specifications and standards to ensure a perfect fit, function, and form on your rig. Better yet, these gaskets install directly in place of your factory components to take any stress associated with modifying your engine. GM Duramax Fitments: 2004, 2005 GM 6.6L Duramax. Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali. Some exceptions apply, please see individual product pages for specific fitments.