2004.5-2005 GM Duramax 6.6L LLY Engine Building Parts

Whether you're looking to completely rebuild your 2004.5-2005 GM 6.6L Duramax LLY, or you simply need some engine parts for preventative maintenance, we have your back here at Alligator Performance! Featuring one of the best and most reliable selections of engine building parts on the aftermarket, we carry everything from head gaskets and valve covers to complete crate engines to ensure you'll find exactly what you need for your custom build. Each one of these premium engine components is built to either meet or exceed OEM specifications, ensuring a perfect fit and fucntion on your Sierra/Silverado 2500/3500 on your rig. 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.