ARP 223-3700 Pro Series Cylinder Head Bolt Kit - 12-Point

The ARP 223-3700 Pro Series head bolt kit delivers professional-grade clamping force and reliability for high-performance and competition engines. These fasteners are engineered to exceed the demands of serious engine builders who require absolute durability and precision.

Pro Series Construction:

• Cold-forged from premium 8740 chrome moly steel for molecular integrity
• Heat-treated to 200,000 psi tensile strength before thread rolling
• Centerless ground after heat-treatment for exceptional concentricity and straightness
• Thread rolled after heat-treat for 10x better fatigue strength than pre-treated threads
• 12-point head design with reduced wrenching profile and wide-area flange
• Undercut short bolts provide optimized stretch characteristics for even clamping force

Performance Benefits:

• Superior clamping force distribution helps prevent head gasket failure
• Precise tolerances ensure cylinder heads and gaskets align perfectly during assembly
• Wide flange head eliminates valve train removal for cylinder head retorquing
• Accommodates larger diameter valve springs for performance applications
• Hardened parallel-ground washers included for accurate torque readings

ARP Pro Series fasteners meet the company's zero-defect, zero-failure quality standard and are the choice of leading professional engine builders across all forms of motorsports. Each kit includes hardened washers and is application-specific for optimal performance. Remember to re-torque after initial engine break-in as head gaskets compress during the first heat cycle.