ARP 234-4309 Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 234-4309 is a professional-grade cylinder head stud kit engineered for high-performance and competition engines. Manufactured from premium 8740 chrome moly steel, these fasteners deliver exceptional strength and reliability for demanding applications where head gasket sealing is critical.

Material and Heat Treatment:

• Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
• Vertical rack heat-treatment process ensures complete and uniform heat penetration
• Thread rolled after heat-treat for approximately 1000% better fatigue strength than pre-heat-treat threading
• Centerless ground for precise concentricity and perfect alignment

Design Features:

• 12-point head design for secure engagement and easy installation
• Shorter studs feature undercuts to equalize stretch and provide more consistent clamping force
• Undercut design compensates for head gasket compression to prevent blown gaskets
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings

Performance Benefits:

• Superior clamping force compared to standard head bolts
• Studs stretch only on vertical axis during torquing for more accurate and consistent loading
• Precision manufacturing allows cylinder heads and gaskets to align perfectly during assembly
• Meets ARP's zero-defect, zero-failure quality standard

ARP studs are the preferred choice of professional engine builders across all forms of motorsports. Each stud is manufactured to exacting tolerances using processes that far exceed industry standards, ensuring optimum engine sealing and long-term reliability in high-stress applications.

Note: Studs should be installed finger-tight in a relaxed mode. Re-torque after initial engine operation to compensate for head gasket compression.