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USD 614.99
Part #: ARP230-4201

ARP 230-4201 Diesel Head Stud Kit

Vehicle Fitment:
2001-2016 GM 6.6L Duramax LB7/LLY/LBZ/LMM/LML
Part #: ARP230-4201
★★★★★ ★★★★★ 8 Reviews
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Upgrade your 2001-2016 GM 6.6L Duramax LB7/LLY/LBZ/LMM/LML with an ARP Diesel Head Stud Kit 230-4201 from XDP. It’s a proven fact that OEM head bolts are the weak link in a diesel engine; especially if the engine has been modified. That’s because most engines are typically assembled from the factory using Torque-To-Yield (TTY) bolts and preloaded to yield and beyond (typically 100-110%). Any increases in combustion pressure can lead to problems like blown head gaskets or catastrophic engine failure. Furthermore, because TTY bolts are yielded by design, they should never be re-used.

ARP is the industry leader when it comes to fasteners and offers heavy-duty head studs for a wide variety of popular diesel applications. Using head studs instead of standard head bolts provides your engine with the clamping force required to keep your cylinder heads from lifting and blowing a head gasket due to higher combustion pressures. For the 230-4201 Head Studs, ARP starts with a premium grade ARP2000 alloy that is rated far superior to aircraft quality alloy steels. ARP2000 is an alloy steel that can be safely heat treated to a higher level, producing a greater strength material than Chrome Moly 8740. While 8740 and ARP2000 share similar characteristics, ARP2000 is capable of achieving a higher clamp load at 220,000 psi.

Each stud is placed vertically into special racks and precisely heat-treated. This procedure ensures complete heat penetration and is far superior to those lower quality studs from other manufacturers who just drop pieces in a basket. ARP head studs then begin a centerless grinding process to ensure that they are perfectly concentric. As many as ten separate machining steps are required to achieve this level of accuracy. The thread rolling operation is also done after the heat-treatment, which gives them about 2000% (that’s 20 times) better fatigue strength than lesser studs that are threaded prior to heat-treat. It costs a lot more to do it this way, because it’s tough on tooling, but the results are worth the additional effort. Fasteners are then shot-peened to remove any surface irregularities and upgrade the overall external integrity. Finally, a metal finishing process is also performed in-house with a durable black oxide coating applied for improved corrosion resistance.

There is a good reason that virtually every top professional engine builder relies on ARP head studs for their all-out competition powerplants. Simply put, there’s not a better stud setup on the market today. This head stud kit is a direct-fit for the 6.6L Duramax LB7/LLY/LBZ/LMM/LML engines found in Chevy Silverado and GMC Sierra 2500HD/3500HD pickup trucks and Express/Savana vans.

  • Proprietary ARP 2000 Material
  • Rated At 220,000 Psi Tensile Strength
  • Includes Chrome Moly Steel 12-Point Nuts
  • Black Oxide Coating For Improved Corrosion Resistance
  • Centerless Ground To Ensure They Are Perfectly Concentric
  • Improved Clamping Force Prevents Cylinder Heads From Lifting
  • Broached Stud Ends Install & Make Cylinder Head Removal Easier
  • Heat-Treated Prior To Thread Rolling And Machining For Optimum Fatigue Strength
  • Shot-Peened To Remove Any Surface Irregularities And Upgrade The Overall External Integrity
  • Hardened Parallel Ground Washers For An Even Load Distribution And More Accurate Torque Readings
  • Comes With 0.5oz Of ARP Fastener Assembly Lubricant
XDP Thread Cleaning Chasers (Sold Separately): 
The XDP Thread Cleaning Chasers XD40124TC & XD40128TC are an excellent add-on for the seasoned technician, or the at-home mechanic. Using Thread Cleaning Chasers ensures that you are able to properly clean the threads in your engine block before the installation of this head stud kit. Clean threads will provide you with accurate torque readings which are critical to your head gasket repair, or engine build.

    Vehicle Fitment

    2001 Chevy 6.6L LB7 Duramax
    2002 Chevy 6.6L LB7 Duramax
    2003 Chevy 6.6L LB7 Duramax
    2004 Chevy 6.6L LB7 Duramax
    2004.5 Chevy 6.6L LLY Duramax
    2005 Chevy 6.6L LLY Duramax
    2006 Chevy 6.6L LLY/LBZ Duramax
    2007 Chevy 6.6L LLY/LBZ Duramax
    2007.5 Chevy 6.6L LMM Duramax
    2008 Chevy 6.6L LMM Duramax
    2009 Chevy 6.6L LMM Duramax
    2010 Chevy 6.6L LMM Duramax
    2011 Chevy 6.6L LML Duramax
    2012 Chevy 6.6L LML Duramax
    2013 Chevy 6.6L LML Duramax
    2014 Chevy 6.6L LML Duramax
    2015 Chevy 6.6L LML Duramax
    2016 Chevy 6.6L LML Duramax
    2001 GMC 6.6L LB7 Duramax
    2002 GMC 6.6L LB7 Duramax
    2003 GMC 6.6L LB7 Duramax
    2004 GMC 6.6L LB7 Duramax
    2004.5 GMC 6.6L LLY Duramax
    2005 GMC 6.6L LLY Duramax
    2006 GMC 6.6L LLY/LBZ Duramax
    2007 GMC 6.6L LLY/LBZ Duramax
    2007.5 GMC 6.6L LMM Duramax
    2008 GMC 6.6L LMM Duramax
    2009 GMC 6.6L LMM Duramax
    2010 GMC 6.6L LMM Duramax
    2011 GMC 6.6L LML Duramax
    2012 GMC 6.6L LML Duramax
    2013 GMC 6.6L LML Duramax
    2014 GMC 6.6L LML Duramax
    2015 GMC 6.6L LML Duramax
    2016 GMC 6.6L LML Duramax
    2003 Chevy Kodiak / GMC TopKick 6.6L LB7 Duramax
    2004 Chevy Kodiak / GMC TopKick 6.6L LB7 Duramax
    2004.5 Chevy Kodiak / GMC TopKick 6.6L LLY Duramax
    2005 Chevy Kodiak / GMC TopKick 6.6L LLY Duramax
    2006 Chevy Kodiak / GMC TopKick 6.6L LLY/LBZ Duramax
    2007 Chevy Kodiak / GMC TopKick 6.6L LLY/LBZ Duramax
    2007.5 Chevy Kodiak / GMC TopKick 6.6L LMM Duramax
    2008 Chevy Kodiak / GMC TopKick 6.6L LMM Duramax
    2009 Chevy Kodiak / GMC TopKick 6.6L LMM Duramax
    2010 Chevy Kodiak / GMC TopKick 6.6L LMM Duramax


    • MFG. Number 230-4201
    • Manufacturer Name ARP
    • Shipping Weight 13.00 lb.
    • Shipping Length 11 in.
    • Shipping Width 8 in.
    • Shipping Height 3 in.
    • Fuel Type Diesel
    • UPC 672036032678
    • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
    • Internal L175.00R79.00


    ★★★★★ ★★★★★
    4.8/5 Stars out of 8 Reviews
    Verified Buyer
    Duramax ARP Stud kit.
    Great product!
    Verified Buyer
    ARP head stud kit
    Great product , great price and fast shipping. XDP is a awesome company to work with!
    Verified Buyer
    ARP head stud kit order #1857684
    Great product at a great price.
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    Questions and Answers

    What are the torque specs on these bolts?
    View Staff Answer 
    Click Here
    Will one kit do both heads?
    View Staff Answer 

    Correct! ARP DIESEL HEAD STUD KIT 230-4201 is a complete head stud kit for the 2001-2016 GM 6.6L Duramax engines.

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