Staff Answer
Aug 31, 2026 - 12:05 PM
The main difference between the ARP 2000 and ARP 625+ Cummins head studs is the material and the amount of clamping force they can provide.
ARP 2000 studs have a tensile strength of roughly 220,000 PSI and are an excellent choice for most street-driven, towing, and moderately modified Cummins trucks. They provide a significant increase in head clamping force compared with the factory hardware and are more than enough for the majority of builds.
ARP Custom Age 625+ studs step up to approximately 260,000–280,000 PSI tensile strength. They provide greater clamping capability and are generally recommended for higher-horsepower, higher-boost applications where cylinder pressure becomes much more aggressive.
In simple terms:
• ARP 2000: Best choice for most street, towing, and moderate-performance builds.
• ARP 625+: Best choice for high-horsepower/high-boost builds where maximum head clamping force is needed.
If you're building a normal street truck, ARP 2000s are usually the better value. If you're planning on pushing the engine hard with big boost and considerably higher cylinder pressure, the 625+ studs give you additional headroom.
