Description: This Main Stud Kit (Part Number: MSK667Y) is a must - have for 2001 - 2005 GMC/Chevrolet HD trucks with LB7/LLY 6.6L Duramax engines. If you're aiming for modifications and high horsepower, these main studs are the perfect solution. They hold the bottom end together, clamping the crank firmly in place. This gives you increased stability, more precise torque application, and effectively prevents distortion under high loads. Features include improved strength over the factory, no twisting during tightening, a more consistent clamping force, and overall better performance under high - stress conditions. Click here for installation instructions.

How to use: Install the main stud kit according to the provided installation instructions. Make sure to follow the torque specifications carefully. Note: Before installation, clean the engine area thoroughly to avoid any debris getting into the engine. Check the studs for any damage or defects. Maintenance: Periodically check the tightness of the studs, especially after long - distance driving or high - performance use. If you notice any unusual noises or vibrations, inspect the studs immediately. Keep the engine well - lubricated to ensure the longevity of the studs.