Product Description

ARP 230-4201 HEAD STUD KIT FOR 2001–2016 GM 6.6 DURAMAX

Upgrade your 2001–2016 GM 6.6L Duramax (LB7/LLY/LBZ/LMM/LML) with the proven ARP 230-4201 Head Stud Kit for superior clamping force, consistent torque, and long-term head gasket sealing under towing, tuning, or big-boost abuse. This ARP2000 kit includes premium heat-treated studs, 12-point nuts, and hardened parallel washers for even load distribution and reliable torque readings. ARP 230-4201, ARP DURAMAX HEAD STUDS, ARP2000 STUDS, GM 6.6L DURAMAX LB7 LLY LBZ LMM LML, DIESEL PERFORMANCE FASTENERS, HEAD GASKET UPGRADE, CPP DIESEL

Fitment

• GM/Chevrolet 6.6L Duramax Diesel (2001–2016)
• Engine codes: LB7 (2001–2004), LLY (2004.5–2005), LBZ (2006–2007), LMM (2007.5–2010), LML (2011–2016)
• Silverado/Sierra 2500HD & 3500HD

Recommended ARP Cross-References

• ARP 230-4202 CUSTOM AGE 625+ HEAD STUD KIT (2001–2016 Duramax)
• ARP 230-5401 MAIN STUD KIT (2001–2005 LB7/LLY)
• ARP 230-5402 MAIN STUD KIT (2006–2010 LBZ/LMM)
• ARP 129-2503 HARMONIC BALANCER BOLT KIT (2001–2019 Duramax)
• More ARP Duramax Fasteners at CPP Diesel

FAQ

Q: Will ARP 230-4201 fit all 2001–2016 6.6L Duramax engines?
A: Yes. It covers LB7, LLY, LBZ, LMM, and LML platforms.

Q: Do I need to re-torque after heat cycles?
A: Follow ARP’s instructions for lube, torque values, and any re-torque procedure. Always torque on clean, chase-tapped threads with ARP Ultra-Torque.

Q: When should I choose 230-4202 (625+) instead?
A: For extreme cylinder pressure (big single/compounds, nitrous, high timing), 230-4202 offers higher tensile strength. For tuned/towed street trucks, 230-4201 ARP2000 is the proven go-to.

Q: What gaskets and fasteners pair well with these studs?
A: Use quality multi-layer steel head gaskets and consider ARP main studs (230-5401/230-5402) and the ARP balancer bolt (129-2503) for a complete, reliable build.

Specifications for ARP 230-4201

Shop the full ARP lineup at CPP Diesel or browse GM Duramax studs & bolts.