ARP 235-3704 Pro Series Cylinder Head Bolt Kit - 12-Point

The ARP 235-3704 Pro Series cylinder head bolt kit delivers professional-grade fastening performance for high-performance and competition engines. These premium fasteners are engineered to provide superior clamping force and reliability in demanding applications.

Advanced Manufacturing Process:

• Cold-forged construction ensures complete molecular integrity
• Heat-treated to 200,000 psi before thread rolling and machining
• Thread rolled after heat-treat for 10x better fatigue strength than pre-heat-treat threading
• Centerless ground for exceptional straightness and concentricity
• 12-point head design with reduced wrenching profile
• Wide area flanged head eliminates need for valve train removal during retorquing

Premium Materials and Quality:

Constructed from premium grade 8740 chrome moly steel alloy, each bolt undergoes vertical rack heat-treatment for complete and uniform heat penetration. This meticulous process produces fasteners rated at 200,000 psi—significantly stronger than standard Grade 8 hardware. The precise manufacturing tolerances ensure cylinder heads and gaskets align perfectly during installation.

Complete Kit Includes:

• Application-specific head bolts
• Hardened parallel-ground washers for even load distribution
• ARP Ultra-Torque assembly lubricant (where applicable)

Performance Benefits:

Pro Series bolts provide more accurate and consistent torque loading compared to standard fasteners. Selected applications feature undercut short bolts that equalize stretch characteristics, compensating for head gasket compression and helping prevent gasket failures. The reduced wrenching hex and wide flange design accommodates larger diameter valve springs while permitting cylinder head service without complete disassembly.

Every ARP fastener is manufactured to the company's zero-defect, zero-failure quality standard and bears the ARP stamp as assurance of authenticity. Trusted by professional engine builders across all forms of motorsports, ARP Pro Series bolts represent the pinnacle of cylinder head fastening technology.

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