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ARP 247-4204 Diesel Custom Age +625 Head Stud Kit | 98.5-23 5.9L/6.7L Cummins


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ARP has provided an extra measure of security in the form of extra-strong head studs manufactured from the firm’s proprietary Custom Age 625+ material that has a minimum rating of 260,000 psi tensile strength. They are engineered to provide the clamping force required to keep cylinder heads from lifting due to exceptionally high combustion pressures.

It’s a proven fact that OEM head bolts are the weak link in a diesel engine; especially if the engine has been modified. Diesel engines are all assembled using “Torque To Yield” bolts and any increases in combustion pressure can lead to problems like blown head gaskets or catastrophic engine failure. ARP’s Diesel Head Stud Kits are designed for higher clamping loads and are much safer and stronger than OEM. They are available in several different strength materials to safely handle applications from performance street to all-out competition.



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

Additional information

Weight 10 lbs
Dimensions 11 × 8 × 2 in


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