ARP 223-3704 Pro Series Cylinder Head Bolt Kit - 12-Point

The ARP 223-3704 Pro Series head bolt kit delivers professional-grade fastening performance for demanding competition engines. These premium fasteners combine advanced metallurgy with precision manufacturing to provide reliable cylinder head retention in high-stress applications.

Key Features:

• Cold-forged ARP2000 alloy construction rated at 200,000 psi tensile strength
• 12-point head design for secure engagement and accurate torque application
• Heat-treated prior to thread rolling for superior fatigue resistance
• Centerless ground for exceptional straightness and concentricity
• Reduced wrenching profile with wide-area flange eliminates need for valve train removal during retorquing
• Undercut short bolts help equalize stretch and compensate for head gasket compression
• Hardened parallel-ground washers included for even load distribution
• Thread rolled after heat treatment for ten times better fatigue strength

Why Pro Series Bolts:

ARP Pro Series fasteners are manufactured to exacting tolerances that ensure cylinder heads and gaskets align perfectly during assembly. The vertical heat-treatment process provides complete penetration for consistent material properties throughout each bolt. These application-specific fasteners are designed for competition use where reliability and performance are critical.

Each bolt is manufactured to ARP's zero-defect quality standard and undergoes rigorous quality control. The 12-point head configuration allows for precise torque readings while the flanged design provides larger clamping area without interference with oversized valve springs.

Installation Notes:

Always retorque fasteners after initial engine operation to compensate for head gasket compression. Use only the included hardened washers and follow manufacturer's torque specifications with appropriate ARP assembly lubricant for accurate clamping force.