ARP DIESEL CUSTOM AGE 625+ HEAD STUD KIT 247-4204 | 1998.5-2024 5.9L/6.7L CUMMINS

ARP 247-4204 Custom Age 625+ Head Stud Kit

Built for extreme horsepower and competition-level diesel engines, the ARP 247-4204 Custom Age 625+ Head Stud Kit delivers the clamping force needed to keep the cylinder head securely sealed under the highest combustion pressures. Replacing the factory torque-to-yield head bolts with premium ARP studs helps prevent head lift and blown head gaskets in high-performance and heavily modified engines.

Manufactured from ARP's exclusive Custom Age 625+ super alloy, these head studs offer exceptional fatigue resistance, tensile strength, and corrosion protection. Each stud is heat-treated before machining and thread rolling, centerless ground for precise concentricity, shot-peened for added durability, and finished with a black oxide coating for long-lasting corrosion resistance. The result is one of the strongest and most reliable diesel head stud kits available.

Complete with chrome moly 12-point nuts, hardened parallel-ground washers, and ARP Ultra-Torque assembly lubricant, this kit provides everything needed for a professional-quality installation.

Features:

• Manufactured from ARP Custom Age 625+ super alloy
• 235,000–255,000 PSI yield strength
• 260,000–280,000 PSI tensile strength
• Significantly stronger than ARP 2000 and 8740 chromoly fasteners
• Improved clamping force helps prevent cylinder head lift
• Heat-treated prior to machining and thread rolling for superior fatigue life
• Centerless ground for exceptional concentricity and accuracy
• Shot-peened to improve durability and surface integrity
• Black oxide finish for enhanced corrosion resistance
• Broached stud ends simplify installation and cylinder head removal
• Includes chrome moly steel 12-point nuts
• Includes hardened parallel-ground washers for even load distribution
• Includes ARP Ultra-Torque fastener assembly lubricant