ARP 223-4204 Cylinder Head Stud Kit High Performance 8740 Series 12-Point

The ARP 223-4204 is a premium high-performance cylinder head stud kit engineered for serious engine builders who demand maximum reliability and strength. Manufactured from ARP's legendary 8740 chrome moly steel alloy, these fasteners are precision-engineered to deliver 200,000 psi tensile strength—significantly exceeding aircraft-grade materials and standard Grade 8 bolts.

Advanced Manufacturing Process:

• Precision heat-treated using vertical rack process for complete, uniform heat penetration to 200,000 psi
• Centerless ground through multiple passes to ensure exceptional concentricity and straightness
• Thread rolled after heat treatment for approximately 1000% better fatigue strength versus pre-heat-treat threading
• 12-point head design for precise torque application and easy installation
• Undercut short studs engineered to equalize stretch and clamping force across the cylinder head

Performance Benefits:

• Superior clamping force consistency prevents head gasket failure
• Studs install in relaxed mode and stretch only on vertical axis during torquing, unlike bolts which twist under load
• Precise tolerances allow cylinder heads and gaskets to align perfectly during assembly
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings
• Facilitates faster engine assembly and disassembly for racing applications

Each ARP stud is stamped with the ARP logo as your assurance of quality and is backed by the company's zero-defect, zero-failure quality standard. This complete kit provides everything needed for professional-grade cylinder head installation on high-performance and competition engines.

Note: Re-torque all fasteners after initial engine run-in to compensate for head gasket compression.