ARP 430-0202 SS 12pt Lower Rocker Cover Bolt Kit | 2004.5-2010 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax LLY/LMM

Features:

• Stainless steel construction for corrosion resistance
• 12 point head for easy tool access
• Fits Duramax LLY and LMM engines
• Designed for lower rocker cover applications
• Improved clamping force over factory bolts
• Precision rolled threads for accurate torque
• Maintains proper gasket sealing pressure
• Resists rust in harsh engine environments
• Reusable hardware for long term reliability
• Direct fit with no modifications required
• Trusted ARP quality and performance

Finish Your Valve Cover Setup With Clean Hardware That Holds Strong

When you are wrapping up work on your Duramax, the last thing you want is to reinstall worn or corroded factory bolts that take away from the job you just put in. This ARP stainless lower rocker cover bolt kit gives you a clean, reliable upgrade that you will appreciate every time you open the hood. Right away, the stainless construction stands out, not just for looks but for its ability to resist corrosion in a harsh engine bay environment. Additionally, the improved clamping force helps keep the lower rocker cover sealed tight, which is key for preventing oil seepage over time. The 12 point head design also makes installation smoother, especially when working around tight clearances where tool access can be limited. It is a small detail, but one that makes a noticeable difference during install. What’s more, the reusable design means you are not dealing with stretched or weakened bolts during future service. This is the kind of upgrade that finishes the job the right way while adding long term confidence.

Precision Stainless Fasteners Built For Duramax Valve Cover Sealing

The ARP 430-0202 lower rocker cover bolt kit is engineered specifically for GM 6.6L Duramax LLY and LMM engines, ensuring proper fitment and consistent performance. Each fastener is manufactured from high quality stainless steel, providing excellent resistance to corrosion in high heat and oil exposed environments. Furthermore, the threads are precision rolled to enhance strength and improve torque accuracy during installation. This allows for more consistent preload, which is critical for maintaining even clamping force across the lower rocker cover. Proper clamping helps support gasket integrity and reduces the likelihood of leaks developing over time. The 12 point head design improves tool engagement and allows for easier access in confined engine bay areas. Additionally, these bolts are designed to be reusable, making them a dependable option for ongoing maintenance or future upgrades. Altogether, this kit delivers a durable and well engineered fastening solution for maintaining valve cover sealing performance.

Fitment: 2004.5, 2005, 2006, 2007, 2008, 2009, 2010 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax LLY/LMM

Notes:

• Fits Duramax LLY and LMM engines only
• Designed for lower rocker cover applications
• ARP thread lubricant recommended for installation
• Follow ARP torque specifications carefully
• Not intended for upper cover locations
• Ensure sealing surfaces are clean before install
• Inspect gasket condition during service
• Proper torque sequence helps prevent leaks
• Compatible with stock and aftermarket covers
• Ideal for maintenance or engine rebuilds
• Allow engine to cool before installation