ARP 254-4309 Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 254-4309 is a high-performance cylinder head stud kit engineered for demanding competition and high-performance applications. Manufactured from premium grade 8740 chrome moly steel, these studs are heat-treated to 200,000 psi tensile strength, providing exceptional clamping force and reliability under extreme cylinder pressures.

Superior Manufacturing Process:

• Vertical rack heat-treating ensures complete and consistent heat penetration throughout each stud
• Centerless ground after heat-treat for near-perfect concentricity and straightness
• Thread rolled after heat-treatment for approximately 1000% better fatigue strength compared to pre-heat-treat threading
• Precision tolerances allow cylinder heads and gaskets to align perfectly during installation
• Specially undercut shorter studs equalize stretch and provide more consistent clamping force

Key Features:

• 12-point head design for precise torque application
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings
• Rated at 200,000 psi tensile strength—significantly stronger than Grade 8 fasteners
• Reduced wrenching head allows cylinder head service without valve train removal
• Wide-area flanged head design for enhanced clamping surface
• Each stud is ARP-stamped for authenticity and quality assurance

Installation Benefits: Studs provide superior accuracy compared to bolts because they stretch only on the vertical axis during torquing, eliminating the twisting forces that affect bolts. This results in more consistent torque readings and even clamping pressure across the head gasket surface. The undercut design on shorter studs helps prevent head gasket failures by compensating for gasket compression.

Complete kit includes all necessary studs and hardened washers for professional installation. Ideal for racing engines and high-performance street applications where reliability and consistent clamping force are critical.