Gator Fasteners MSK66ZM Heavy Duty Main Stud Kit | 2006-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Features:

• Designed for 2006–2010 6.6L Duramax engines
• Compatible with LBZ and LMM engine platforms
• Replaces weak factory main bolts
• Prevents bottom end movement under load
• Ideal for towing, racing, or daily driving
• Made from high-strength, heat-treated steel
• Resists stretching better than factory bolts
• Provides superior clamping force and durability
• Helps improve engine longevity under stress
• Engineered for high performance builds
• Perfect for boosted or high horsepower setups

Lock Down Your Bottom End With Confidence

When you’re building power into your LBZ or LMM Duramax, the last thing you want is the bottom end shifting under stress. That’s where the Gator Fasteners Heavy Duty Main Stud Kit steps in. Whether your truck is a tow rig, weekend warrior, or daily driver with a little extra punch, these main studs keep everything locked down tight. Factory main bolts simply aren’t built for high-performance applications, they can stretch, shift, and compromise the integrity of your engine over time. Gator’s studs are heat-treated, high-strength, and designed to hold their torque no matter how hard you’re pushing. It’s an affordable upgrade that offers real insurance against failure when the boost is high or the load is heavy. If you’re already into your engine for a rebuild or performance project, this is one of those upgrades that makes complete sense. You’re putting in the time and effort, make sure the bottom end holds together for the long haul.

High Strength Studs Engineered To Handle Serious Power

The Gator Fasteners MSK66ZM Heavy Duty Main Stud Kit is built to replace the factory main bolts on 2006–2010 6.6L Duramax LBZ and LMM engines with a significantly stronger and more reliable solution. These studs are manufactured from premium-grade, heat-treated steel and provide much higher tensile strength compared to OEM hardware. This means they resist stretching and fatigue, particularly under extreme pressure, RPM, or load conditions. By using studs instead of bolts, the clamping force is more evenly distributed across the main bearing caps, improving engine stability and reducing the risk of cap walk during high-stress operation. This is especially critical for trucks running increased horsepower, added boost, or pulling heavy loads regularly. The kit is a great match for performance builds where bottom end integrity is essential, including race applications, heavy towing, or aggressive street setups. These fasteners help reinforce the foundation of your engine, ensuring the rest of your upgrades have a solid base to build from. Gator designed this kit to meet the demands of real-world power and torque, no shortcuts, just strength where it counts.

Fits: 2006, 2007, 2008, 2009, 2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Notes:

• Designed specifically for 2006–2010 LBZ and LMM Duramax engines
• Replaces factory main bolts with stronger heavy-duty studs
• Ideal for high horsepower, towing, and performance builds
• Prevents main cap movement under heavy load or high RPM
• Studs offer greater clamping force and torque retention
• Factory bolts are more prone to stretching over time
• Recommended during bottom end rebuilds or upgrades
• Compatible with daily drivers, tow rigs, and race trucks
• Helps improve engine reliability and bottom end strength