8MM 12pt Valve Cover Bolt Kit

Features:

• Fits LBZ, LLY, LMM, and LML engines
• Includes 8mm 12-point bolts
• High-strength ARP fastener construction
• Corrosion-resistant black oxide finish
• 1/4-20 thread size for secure fit
• Includes matching washers for each bolt
• Improves valve cover seal integrity
• Ideal for performance and stock builds
• Engineered for precision and durability

Valve Cover Bolt Kit for GM 6.6L Duramax

If you’ve ever dealt with leaky valve covers or stripped bolts on your Duramax, you know how frustrating that can be. The ARP 100-7533 8MM 12pt Valve Cover Bolt Kit is a simple upgrade that solves that problem for good, backed by ARP’s legendary strength and precision. Designed specifically for the 2004.5–2016 GM 2500HD and 3500HD trucks running the 6.6L Duramax diesel (LBZ, LLY, LMM, and LML), this kit replaces your factory bolts with high-quality hardware that won’t flex, strip, or loosen over time.

High-Quality Construction & Design

Each bolt in this set features a 12-point 8mm head for a precise fit and easy torque application. The 1/4-20 threads engage cleanly and securely, helping to maintain a tight, leak-free seal around the valve covers, even under high heat and vibration. ARP includes matching washers with every bolt, ensuring even clamping force and a clean, professional finish. What really sets these bolts apart is their construction. Made from ARP’s premium fastener material and finished with a corrosion-resistant black oxide coating, they’re built to handle the demands of high-mileage diesel workhorses and performance builds alike. Whether you're buttoning up a fresh engine or replacing worn-out hardware during a valve cover reseal, this kit brings peace of mind and long-term reliability.

Fitment: 2004.5, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax