ARP 230-4201 Head Stud Kit for 2001-2016 6.6L Duramax (LB7/LLY/LBZ/LMM/LML)

Upgrade your 2001-2016 GM 6.6L Duramax with the ARP 230-4201 Diesel Head Stud Kit—the proven solution for higher boost, increased cylinder pressures, and long-term reliability. Factory torque-to-yield head bolts are a common weak point on modified Duramax engines. These ARP studs deliver significantly higher clamping force to keep the cylinder heads sealed and prevent head gasket failure.

Manufactured from proprietary ARP2000 material and rated at 220,000 psi tensile strength, these studs far exceed the strength of stock fasteners. Each stud is heat-treated, centerless ground for precise concentricity, and features threads that are rolled after heat treatment for superior fatigue strength. The kit includes heat-treated chrome-moly 12-point nuts and parallel-ground washers for even load distribution and accurate torque readings. A durable black oxide coating provides corrosion resistance, and the broached ends simplify installation and future head removal.

Key Features:

• Proprietary ARP2000 alloy – 220,000 psi tensile strength
• Superior clamping force to prevent head lift under elevated boost and combustion pressures
• Threads rolled after heat-treat for dramatically improved fatigue life
• Centerless ground for perfect concentricity
• Includes 12-point chrome-moly nuts and hardened parallel washers
• Black oxide finish for corrosion resistance
• Direct-fit for both cylinder heads

Fitment: 2001-2016 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD with 6.6L Duramax (LB7, LLY, LBZ, LMM, LML). Also compatible with related applications such as certain Express/Savana and Kodiak/Topkick models equipped with the same engines.

Recommended for any Duramax running elevated boost (typically 40+ psi), performance tunes, or heavy towing applications where stock head bolts become a liability. A must-have insurance upgrade for serious builds.