ARP 114-3601 Cylinder Head Bolt Kit - High Performance 8740 Chrome Moly Steel

The ARP 114-3601 High Performance Series cylinder head bolt kit delivers professional-grade engine fastening technology for demanding automotive applications. Engineered with premium 8740 chrome moly steel and rated at 180,000 psi tensile strength—15% stronger than Grade 8—these head bolts provide the superior clamping force and reliability that serious engine builders demand.

Premium Construction and Heat Treatment:

• Premium grade 8740 chrome moly alloy rated at 180,000 psi tensile strength
• Precision heat-treated using vertical rack process for complete heat penetration
• Thread rolled after heat-treatment for exceptional fatigue strength
• Cold-forged construction ensures molecular integrity
• Centerless ground for exceptional concentricity and straightness

Performance-Focused Design:

• Hex head design with reduced wrenching profile
• Wide area flanged head eliminates need for valve train removal during retorquing
• Undercut shorter bolts (where applicable) equalize stretch for consistent clamping force
• Precision manufacturing allows cylinder heads and gaskets to align perfectly during assembly
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings

Applications and Benefits:

High Performance Series head bolts are ideal for street performance and racing applications where engine compartment clearance makes studs impractical. The reduced hex design permits larger diameter valve springs while the wide flange enables quick cylinder head service without removing valve train components. Each kit is manufactured to ARP's exacting quality standards, ensuring zero defect, zero failure performance that professional engine builders trust.

Installation Notes:

Always retorque head bolts after initial engine run-in, as head gaskets will compress during the first heat cycle. Use the included hardened washers to ensure accurate torque readings and even load distribution across the cylinder head surface.