ARP 254-3704 Pro Series Cylinder Head Bolt Kit - 12-Point

The ARP 254-3704 Pro Series cylinder head bolt kit delivers professional-grade fastening performance for high-performance and competition engine builds. These precision-engineered head bolts provide the exceptional strength and reliability that top engine builders demand.

Key Features:

• Cold-forged ARP2000 alloy construction rated at 200,000 psi tensile strength
• 12-point head design for precise torque application
• Heat-treated prior to thread rolling for superior fatigue resistance
• Reduced wrenching hex with wide-area flanged head eliminates valve train removal for retorquing
• Permits use of larger diameter valve springs
• Centerless ground for exceptional concentricity and easy assembly
• Undercut short bolts provide more stretch to compensate for head gasket compression
• Includes hardened parallel-ground washers for even load distribution

Why Pro Series Bolts:

ARP Pro Series head bolts are manufactured to exacting tolerances that ensure cylinder heads and gaskets align perfectly during assembly. The thread rolling process performed after heat treatment provides approximately ten times better fatigue strength compared to pre-heat-treat threading methods. Each bolt is precision-machined to meet ARP's zero-defect, zero-failure quality standard.

The 12-point head design offers more contact points for accurate torque readings, while the wide-area flange distributes clamping load evenly across the cylinder head surface. The undercut design on shorter bolts equalizes stretch characteristics, creating more consistent clamping force that helps prevent head gasket failures and ensures optimal engine sealing.

These bolts are application-specific and designed for use with competition components where maximum performance and reliability are essential. The included hardened washers ensure accurate torque readings and proper load distribution during installation.