ARP 135-3702 Cylinder Head Fasteners 8740 Chrome Moly 12-Point Bolts

The ARP 135-3702 cylinder head fastener kit delivers professional-grade clamping force and reliability for high-performance engine builds. Engineered with premium 8740 chrome moly steel, these fasteners are designed to exceed the demands of competition engines while providing the quality and consistency that professional engine builders depend on.

Premium 8740 Chrome Moly Construction:

Each fastener is manufactured from premium grade 8740 chrome moly alloy rated at 200,000 psi—far superior to aircraft quality materials and 15% stronger than Grade 8 fasteners. ARP's proprietary heat-treatment process involves placing each piece vertically in precision racks to ensure complete and uniform heat penetration throughout the material, resulting in consistent strength characteristics that mass-produced fasteners simply cannot match.

Precision Manufacturing Process:

• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treat for 1000% better fatigue strength than pre-heat-treat threading
• 12-point head design with wide area flange for easier installation and removal
• Hardened parallel-ground washers included for even load distribution and accurate torque readings
• Cold-forged construction ensures molecular integrity throughout the fastener

Performance Benefits:

The precision manufacturing tolerances ensure that cylinder heads and gaskets align perfectly during assembly, eliminating the fitment issues common with lesser quality fasteners. The 12-point head design with wide area flange allows for cylinder head retorquing without removing valve train components, saving critical time during engine service. Selected applications feature undercut shorter bolts that equalize stretch characteristics, providing more consistent clamping force and compensating for head gasket compression to help prevent blown gaskets.

Application and Installation:

Each kit includes all necessary fasteners and hardened washers for a complete cylinder head installation. ARP fasteners should be installed using ARP Ultra-Torque assembly lubricant or moly-based lubricant for accurate torque readings. Always follow the manufacturer's torque specifications and re-torque after initial engine break-in to compensate for gasket compression.

Every ARP fastener is stamped with the ARP logo as your assurance of quality and authenticity. When engine reliability is non-negotiable, professional engine builders trust ARP Pro Series fasteners to deliver zero-defect, zero-failure performance.