ARP 156-4301 Head Stud Kit for Ford 4.6L SOHC/DOHC 12-Point

The ARP 156-4301 head stud kit is engineered for Ford 4.6L SOHC and DOHC engines, delivering superior cylinder head-to-block sealing critical for high-performance applications. Whether you're running high compression pistons, forced induction, or nitrous oxide, these head studs provide the reliable clamping force needed to prevent head gasket failure.

Premium Construction and Manufacturing Process:

• Manufactured from premium 8740 chromoly alloy, rated far superior to standard aircraft quality materials
• Precision heat-treated to 200,000 psi tensile strength for maximum durability
• Centerless ground through approximately ten passes for exceptional concentricity and straightness
• Thread rolled after heat-treat for approximately 1000% better fatigue strength compared to pre-heat-treat threading
• Includes 12-point nuts for improved grip and more even torque distribution

Performance Benefits:

• Exacting tolerances allow cylinder heads and gaskets to glide into perfect alignment during installation
• Specially undercut shorter studs equalize stretch between studs for consistent clamping force
• Compensates for head gasket compression to maintain optimal sealing pressure
• Essential upgrade for turbocharged, supercharged, or nitrous applications

Each ARP head stud kit is manufactured to stringent quality standards, ensuring precise fitment and reliable performance in demanding racing and street applications. The superior manufacturing process and material quality make ARP the choice of leading engine builders and performance enthusiasts.