ARP 135-3711 High Performance Cylinder Head Bolt Kit Chrome Moly - 8740

The ARP 135-3711 High Performance Series cylinder head bolt kit delivers professional-grade engine fastening for demanding applications. Engineered with premium 8740 chrome moly steel and rated at 180,000 psi—15% stronger than Grade 8—these fasteners provide exceptional clamping force and reliability for high-performance builds.

Key Features:

• Premium 8740 chrome moly steel construction rated at 180,000 psi tensile strength
• 12-point head design with wide-area flange for superior torque application
• Reduced wrenching head allows cylinder head retorquing without valve train removal
• Precision heat-treated for consistent strength and durability
• Thread rolled after heat treatment for 10x better fatigue resistance
• Includes hardened parallel-ground washers for even load distribution
• Centerless ground for exceptional concentricity and precise alignment

Engineering Excellence:

ARP manufactures these fasteners using advanced processes that set them apart from competitors. Each bolt is vertically rack heat-treated to ensure complete and uniform heat penetration throughout the material. The centerless grinding process—involving approximately ten precision cuts—produces exceptionally straight fasteners with superior concentricity. This exacting tolerance means cylinder heads and gaskets align perfectly during installation.

Performance Advantages:

The thread rolling process occurs after heat treatment, a more expensive manufacturing method that significantly enhances fatigue strength compared to pre-heat-treat threading. The 12-point head design and wide flange eliminate the need for valve train removal during retorquing procedures, saving valuable time during engine service. The included hardened washers ensure accurate torque readings and consistent clamping force across all fasteners.

These High Performance Series head bolts are ideal for street performance and competition applications where superior strength and reliability are essential. The ARP name stamped on each fastener guarantees authentic quality and zero-defect manufacturing standards trusted by professional engine builders worldwide.