ARP 400-7534 Hex Head Valve Cover Bolt Kit | 2004.5-2016 GM 2500HD/3500HD 6.6L Duramax

Features: - Compatible with LBZ, LLY, LMM, and LML - Hex head bolts for easy installation - 8mm socket size for direct fit - 1/4-20 thread size matches factory spec - Includes washers for even torque spread - Improves valve cover seal and reliability - Durable hardware for long-lasting performance Hex Head Cover Valve Bolt Kit for GM 2500HD/3500HD If you’ve ever dealt with stripped, rusted, or inconsistent valve cover bolts on your Duramax, you know how frustrating it can be—especially when you're trying to keep leaks at bay or chasing down torque issues. The ARP Hex Head Valve Cover Bolt Kit is a rock-solid upgrade for your 2004.5–2016 GM 2500HD or 3500HD with the 6.6L Duramax, covering LBZ, LLY, LMM, and LML engines. This kit replaces your factory hardware with ARP’s premium-grade fasteners, built from high-strength material and designed to hold torque reliably over time. The 8mm hex heads make for easy installation with a common socket, and the included washers help distribute clamping force evenly—reducing the risk of warping your valve covers or creating uneven pressure on the gasket. Fits: 2004.5, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 GM 2500HD/3500HD 6.6L Duramax