SS 12pt Upper Rocker Cover Bolt Kit

Features:

• Stainless steel construction resists corrosion
• 12 point head for improved tool access
• Fits 2004.5-2010 Duramax LLY and LMM
• Designed for upper rocker cover applications
• Improved clamping force over factory bolts
• Maintains proper valve cover sealing pressure
• Precision rolled threads for accurate torque
• Resists rust in high heat environments
• Reusable hardware for long term service
• Direct fit with no modifications required
• Trusted ARP engineering and quality

Give Your Valve Covers A Clean Look With Hardware That Performs

When you are dialing in your Duramax, it is often the small finishing touches that separate a quick job from something you are actually proud of. This ARP upper rocker cover bolt kit brings both style and reliability to the top end of your engine, replacing factory hardware that tends to wear out or corrode over time. Right away, the stainless steel construction stands out, giving you a cleaner look while also holding up better in harsh engine bay conditions. Additionally, the improved clamping force helps keep your valve cover sealed properly, which goes a long way in preventing oil seepage that can make a mess over time. The 12 point head design also makes life easier during install, especially when space is tight and you need solid tool engagement. It is the kind of upgrade that feels right when you are already in there doing maintenance or upgrades. What’s more, the reusable design means you are set up for future service without worrying about replacing worn bolts again. It is a simple change that adds both confidence and a more refined finish under the hood.

Precision Stainless Fasteners Built For Consistent Duramax Sealing Performance

The ARP 430-0203 upper rocker cover bolt kit is engineered for 2004.5-2010 GM 6.6L Duramax LLY and LMM engines, ensuring proper fitment and reliable performance. Each fastener is manufactured from high quality stainless steel, offering strong resistance to corrosion in high heat and oil exposed environments. Furthermore, the threads are precision rolled to improve strength and provide more accurate torque readings during installation. This allows for consistent preload across the rocker cover, which is critical for maintaining gasket integrity over time. The 12 point head design improves tool engagement and helps reduce the risk of fastener damage during installation or removal. Additionally, the hardware is designed to be reusable, supporting long term serviceability when proper torque procedures are followed. The kit includes the correct bolts for the upper rocker cover, making it a straightforward replacement without modification. 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 2004.5-2010 LLY and LMM engines only
• Designed for upper rocker cover applications
• ARP thread lubricant recommended for installation
• Follow ARP torque specifications carefully
• Not intended for lower cover locations
• Ensure sealing surfaces are clean before install
• Inspect valve cover gasket condition
• Proper torque sequence helps prevent leaks
• Compatible with stock and aftermarket covers
• Ideal for maintenance or engine rebuilds
• Allow engine to cool before installation