2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Head Studs & Main Studs

If you've already began upgrading and modifying your 2004.5-2005 GM 6.6L Duramax LLY, you're going to eventually need to replace the OEM head studs to ensure your engine stays in one place during more extreme applications. Aftermarket head studs are vital for high-performance engines sporting high compression or turbochargers, so it's ideal to invest in only the highest-quality replacements for your truck. These aftermarket studs are also much less likely to twist while being torqued, providing your engine with the ability to obtain more accurate torque values in every situation. 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.