ARP Diesel Custom Age 625+ Head Stud Kit 247-4205

The ARP Diesel Custom Age 625+ Head Stud Kit 247-4205 from XDP is the ideal upgrade for your competition or high-horsepower 1989-1998 Dodge 5.9L Diesel. 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 247-4205 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.

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