ARP 135-4304 High Performance Cylinder Head Stud Kit Chrome Moly Steel - 8740

The ARP 135-4304 cylinder head stud kit delivers professional-grade engine fastening performance using premium 8740 chrome moly steel construction. Engineered for high-performance and racing applications, this Pro Series kit features 12-point head studs rated at 200,000 psi tensile strength—significantly stronger than standard Grade 8 fasteners.

Advanced Manufacturing Process:

• Premium 8740 chrome moly alloy heat-treated to 200,000 psi in vertical racks for complete heat penetration
• Centerless ground construction ensures exceptional concentricity and straightness for precise alignment
• Thread rolled after heat-treat for approximately 1000% better fatigue strength than pre-heat-treat threading
• Cold-forged to maintain molecular integrity throughout the fastener
• Undercut shorter studs equalize stretch for more consistent clamping force

Performance Benefits:

• Superior clamping force helps prevent head gasket failures
• Precision tolerances allow cylinder heads and gaskets to align perfectly during installation
• 12-point head design with wide area flange eliminates need for valve train removal during retorquing
• Studs install in relaxed mode and stretch only on vertical axis when torqued, providing more accurate and consistent loading compared to bolts
• Hardened parallel-ground washers included for even load distribution and accurate torque readings

Each stud is manufactured to exacting ARP quality standards and marked with the ARP stamp as assurance of authenticity. This complete kit provides everything needed for reliable cylinder head installation in demanding performance and competition environments.