Product Description

ARP 230-5402 MAIN STUD KIT FOR 2006–2010 GM 6.6 DURAMAX (LBZ/LMM)

Upgrade the bottom end of your LBZ/LMM with the ARP 230-5402 Main Stud Kit—engineered for repeatable clamping force, precise torque, and long-term reliability in high-boost, high-load builds. ARP’s premium alloy studs deliver ~190,000 psi tensile strength with 12-point nuts and hardened washers for consistent preload and main-cap stability. Designed specifically for the 2006–2010 GM 6.6L Duramax, this kit is a must for performance builds, towing rigs, and freshen-ups where bearing cap control matters.

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• Application-specific for 2006–2010 GM 6.6L Duramax LBZ & LMM
• Approx. 190,000 psi tensile strength studs with 12-point nuts & washers
• Improved main cap alignment and crankshaft stability under load
• Includes all required hardware; pair with ARP Ultra-Torque for best results

Fitment

• 2006–2007 Chevy/GMC 6.6L Duramax LBZ
• 2007.5–2010 Chevy/GMC 6.6L Duramax LMM
• Chassis: Silverado/Sierra 2500HD & 3500HD (LBZ/LMM years above)

FAQ

DO I NEED MAIN STUDS ON A STOCK OR TOWING BUILD?
Yes—main studs provide more consistent clamping than OE bolts, improving bearing cap stability for longevity and insurance on tuned/towing applications.

WHAT TORQUE LUBE SHOULD I USE?
Use ARP Ultra-Torque Assembly Lubricant for accurate preload and repeatable torque results. See: ARP 100-9910 Ultra-Torque.

CAN I INSTALL WITH THE ENGINE IN THE TRUCK?
Many builders install with the engine in chassis, but always follow ARP’s sequence/instructions and verify bearing clearances and crank rotation when swapping fasteners.

WHAT SOCKET SIZES ARE REQUIRED?
This kit uses 12-point nuts; consult the ARP instruction sheet for specific socket sizes and tightening steps.

Recommended ARP Pairings

• ARP 230-4201 Head Stud Kit (LB7/LLY/LBZ/LMM/LML)
• ARP 230-4202 625+ Head Stud Kit (LB7–LML)
• ARP 230-5401 Main Stud Kit (LB7/LLY)
• ARP 230-6301 Rod Bolt Kit (LB7/LLY/LBZ/LMM)
• ARP 129-2503 Balancer Bolt Kit (2001–2019 6.6L)
• ARP 100-9910 Ultra-Torque Assembly Lubricant

Specifications for ARP 230-5402