ARP 134-4308 Pro Series Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 134-4308 Pro Series Head Stud Kit delivers the ultimate in cylinder head clamping force and reliability for high-performance and competition engines. Manufactured from premium 8740 chrome moly steel and heat-treated to 200,000 psi tensile strength, these fasteners represent the gold standard trusted by professional engine builders worldwide.

Superior Manufacturing Process:

• Premium 8740 chrome moly alloy rated superior to aircraft quality
• Vertical rack heat-treatment to 200,000 psi ensures complete and uniform heat penetration
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treatment for 1000% better fatigue strength compared to pre-heat-treat threading
• 12-point head design for easy installation and torquing

Performance Advantages:

• Provides more accurate and consistent torque loading compared to head bolts
• Studs stretch only on vertical axis during torquing, eliminating twist-induced stress
• Undercut shorter studs equalize stretch for more consistent clamping force
• Compensates for head gasket compression to prevent blown gaskets
• Precision tolerances allow cylinder heads and gaskets to glide into perfect alignment

Kit Includes:

• Complete head stud set for application
• Hardened parallel-ground washers for even load distribution
• Premium nuts with 12-point configuration

Each stud is stamped with the ARP logo as assurance of quality and bears the company's zero-defect, zero-failure quality standard. While head bolts may be necessary for some street applications where engine removal is impractical, studs provide superior performance and easier assembly for racing and high-performance builds requiring frequent servicing. Always re-torque fasteners after initial engine break-in to compensate for gasket compression.