ARP 144-3601 Cylinder Head Fasteners Hex Head Bolt Kit 8740 Chrome Moly

The ARP 144-3601 High Performance Series cylinder head bolt kit delivers professional-grade clamping force for demanding engine applications. Manufactured from premium 8740 chrome moly steel, these hex head fasteners are heat-treated to 180,000 psi—approximately 15% stronger than Grade 8 bolts—providing exceptional strength and reliability for high-performance engines.

Key Features:

• Premium 8740 chrome moly steel construction rated at 180,000 psi tensile strength
• Precision heat-treatment process ensures complete material penetration and consistent strength
• Thread rolled after heat-treatment for superior fatigue resistance
• Hex head design with wide-area flange eliminates need for valve train removal during retorquing
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings
• Centerless ground for exceptional straightness and precise alignment

Why ARP Fasteners:

ARP's manufacturing process sets the industry standard for cylinder head fasteners. Each bolt is vertically rack heat-treated to ensure uniform properties throughout, then centerless ground through multiple precision cuts for near-perfect concentricity. This exacting process ensures cylinder heads and gaskets align effortlessly during assembly. Thread rolling after heat-treatment—rather than before—provides approximately ten times better fatigue strength than conventional manufacturing methods.

Installation Notes:

The reduced wrenching hex and wide flanged head design allows for cylinder head retorquing without removing valve train components, making maintenance significantly easier. Always retorque fasteners after initial engine run-in to compensate for head gasket compression. Use the included hardened washers to ensure proper load distribution and accurate torque readings.

Trusted by professional engine builders across all forms of motorsports, ARP fasteners represent the highest quality standard in engine assembly hardware. Each fastener is marked with the ARP stamp as assurance of quality and authenticity.