ARP 230-5402 Main Stud Kit for 2006-2016 GM 6.6 L Duramax (LBZ/LMM/LML)

Vehicle Fitment

• 2006-2016 GM 6.6 L Duramax Diesel (LBZ, LMM, LML) - Silverado/Sierra HD

Features

• Constructed from premium 8740 chrome-moly steel
• Heat-treated to 200,000 psi tensile strength
• Precision centerless ground and rolled post-heat treat for fatigue resistance
• Black oxide finish for enhanced corrosion protection
• Includes side bolts and main studs to secure crankshaft cap
• Supplied with ARP Moly assembly lubricant for accurate torque preload
• Prevents main bearing walk and fretting under extreme stress
• Essential for high-performance applications and engine rebuilds

Specifications

• Material: 8740 chrome-moly steel
• Tensile Strength: 200,000 psi
• Socket Sizes: 11/16" 12-point (main studs), 9/16" 12-point & 3/16" Allen (side bolts)
• Finish: Black oxide
• Includes: Main studs, side bolts, ARP Moly lubricant
• Drivetrain Compatibility: Engine-specific; vehicle drivetrain independent

Included Components

• Main studs (quantity for all main caps)
• Side bolts (for cap retention)
• ARP Moly assembly lubricant packet
• Installation instructions

Product Description

The ARP 230-5402 Main Stud Kit is specifically engineered for the 6.6 L Duramax Diesel engines - LBZ, LMM, and LML - used in heavy-duty GM trucks from 2006 to 2016. This kit replaces the weaker factory fasteners with premium 8740 chrome-moly studs that are heat-treated to 200,000 psi tensile strength, ensuring long-lasting clamping force and stability in high-stress environments.

Each stud is centric-ground and thread-rolled after heat treatment to provide superior fatigue resistance. The black oxide finish enhances protection against corrosion. Included side bolts ensure full crankshaft main cap retention, while ARP Moly assembly lubricant enables proper torque and preload settings. This kit is vital for anyone rebuilding or upgrading a Duramax engine for performance or longevity.