ARP 209-4701 High Performance Cylinder Head Stud Kit Chrome Moly - 8740

The ARP 209-4701 cylinder head stud kit delivers professional-grade clamping performance for high-performance and racing engines. Manufactured from premium 8740 chrome moly steel and heat-treated to 200,000 psi, these studs provide superior strength and reliability compared to standard head bolts.

Key Features:

• 8740 chrome moly alloy construction rated at 200,000 psi tensile strength
• Undercut studs equalize stretch and provide more consistent clamping force
• 12-point nuts for precise torque application
• Centerless ground after heat-treat for exceptional straightness and concentricity
• Thread rolled after heat-treat for 10x better fatigue strength
• Hardened parallel-ground washers included for even load distribution
• Vertical heat-treatment process ensures complete and uniform heat penetration

Performance Benefits:

Head studs offer significant advantages over traditional head bolts. Because studs are installed in a relaxed state and only stretch vertically when torqued, they provide more accurate and consistent clamping force. The undercut design on shorter studs compensates for head gasket compression, helping prevent blown gaskets and ensuring optimal cylinder head sealing. The precision manufacturing allows gaskets and cylinder heads to align perfectly during assembly.

Installation Notes:

Install studs finger-tight in a relaxed mode—never force them in using a jammed nut. Always re-torque after initial engine run to compensate for head gasket compression. The 12-point nut design and wide-area flange eliminate the need for valve train removal during retorquing procedures.

ARP Pro Series head studs are the choice of professional engine builders across all forms of racing, manufactured to exacting tolerances with ARP's zero-defect quality standard.