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USD 1232.31
Part #: ARP247-4204

ARP 247-4204 Diesel Custom Age 625+ Head Stud Kit

1998.5-2023 Dodge Ram 5.9L/6.7L Cummins 24V
Part #: ARP247-4204
★★★★★ ★★★★★ 5 Reviews
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The ARP 247-4204 Diesel Custom Age 625+ Head Stud Kit from XDP is the ideal upgrade for your competition or high-horsepower 1998.5-2023 Dodge Ram 5.9L/6.7L Cummins 24V. 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 head from lifting due to higher combustion pressures. It’s a proven fact that OEM head bolts are the weak link in a diesel engine; especially when the engine has been heavily modified. That’s because most engines are typically assembled from the factory using weaker 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.

The 247-4204 Head Studs utilize ARP’s Custom Age 625+ featuring a high-strength chromium-cobalt nickel alloy. This newly formulated super-alloy demonstrates superior fatigue cycle life, tensile strength and toughness, with complete resistance to atmospheric corrosion and oxidation. ARP is the first to develop manufacturing and testing processes for fasteners with Custom Age 625+. Typical tensile strength is 260,000-280,000 psi and a yield strength of 235,000-255,000 psi. This results in a fastener that is stronger than Chrome Moly 8740 and ARP 2000, and is well suited for use in high-performance applications.

ARP head studs begin by being 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 place the pieces in a basket. Head studs then move to 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 24-valve 5.9L and 6.7L Cummins engines found in Ram 2500/3500 pickups.

  • Custom Age 625 Plus Super Alloy
  • 235K-255K psi Yield Strength
  • 260K-280K 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

Vehicle Applications

1998.5 Dodge 5.9L 24V Cummins
1999 Dodge 5.9L 24V Cummins
2000 Dodge 5.9L 24V Cummins
2001 Dodge 5.9L 24V Cummins
2002 Dodge 5.9L 24V Cummins
2003 Dodge 5.9L 24V Cummins
2004 Dodge 5.9L 24V Cummins
2004.5 Dodge 5.9L 24V Cummins
2005 Dodge 5.9L 24V Cummins
2006 Dodge 5.9L 24V Cummins
2007 Dodge 5.9L 24V Cummins
2007.5 Dodge 6.7L 24V Cummins
2008 Dodge 6.7L 24V Cummins
2009 Dodge 6.7L 24V Cummins
2010 Ram 6.7L 24V Cummins
2011 Ram 6.7L 24V Cummins
2012 Ram 6.7L 24V Cummins
2013 Ram 6.7L 24V Cummins
2014 Ram 6.7L 24V Cummins
2015 Ram 6.7L 24V Cummins
2016 Ram 6.7L 24V Cummins
2017 Ram 6.7L 24V Cummins
2018 Ram 6.7L 24V Cummins
2019 Ram 6.7L 24V Cummins
2020 Ram 6.7L 24V Cummins
2021 Ram 6.7L 24V Cummins
2022 Ram 6.7L 24V Cummins
2023 Ram 6.7L 24V Cummins


  • MFG. Number 247-4204
  • Manufacturer Name ARP
  • Shipping Weight 10.00 lb.
  • Shipping Length 11 in.
  • Shipping Width 8 in.
  • Shipping Height 3 in.
  • Fuel Type Diesel
  • UPC 672036035648
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Internal L0.00R0.00


★★★★★ ★★★★★
4.8/5 Stars out of 5 Reviews
Verified Buyer
ARP sets the bar high
I recently installed a set of a ARP 625 head studs, and the quality is unmatched. Install went flawless, and XDP is always great to deal with. Thanks again! Order# 1372359
Awesome company and quick shipping
As expected great service and great company to buy from quick shipping and quality products.
ARP 625+ Head Studs
Where to begin...first off, I would like to state that the freaking customer service xtreme diesel provides is by far the best fffffffffffffffffff “taking in a breath” ffffffffffffff freaking customer service I’ve ever had!!!! So quick to help me out with any questions I had & the friendliest most honest task of people I’ve ever dealt with!!!! So I would like to say thank y’all so much for everything you’ve done for me!!! & now, for the moment we’ve all been waiting for...the review of these ARP 625+ Head Studs...I mean what can I say, other than, yes they may be expensive some may say, but ask yourself this... would you go to a cheaper heart surgeon to save a couple bucks who claims to be ok at what’s he does or go to the heart surgeon who is more pricey, but not with just a bunch of hands on experience under their belt, but also studied & became so knowledgeable at what they do so they can perfect it??? If ya said the cheap heart surgeon, well my friend, it was nice knowing you haha but honestly, these ARP 625s are bad “donkey” not just looking, but at doing what they’re exactly designed to do!!! I love them & definitely don’t regret my purchase & also will be buying more of my product needs from xtreme diesel as I have been also in the past!!! Great website/company & also great ARP 625+ head studs!!!!
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Questions and Answers

How many are in this kit ?
View Staff Answer 

ARP Diesel Custom Age 625 Head Stud Kit 247-4204 includes 26 studs, nuts and washers.

Can the studs be reused or are they one time use only?
View Staff Answer 
Yes. As long as the fasteners have been installed and torqued correctly, and show no visible signs of damage, they can be re-used. If they show any signs of thread galling or corrosion, they should be replaced.

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