ARP 190-3607 High Performance Cylinder Head Bolt Kit Chrome Moly - 8740

The ARP 190-3607 High Performance Series cylinder head bolt kit delivers professional-grade clamping force and reliability for demanding engine builds. Engineered with premium 8740 chrome moly steel, these fasteners are rated at 180,000 psi—15% stronger than Grade 8 hardware—providing the strength needed for high-performance and competition applications.

Advanced Manufacturing Process:

• Precision heat-treated to 200,000 psi using vertical rack processing for complete heat penetration
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treatment for 1000% better fatigue strength compared to pre-heat-treat threading
• Cold-forged construction ensures molecular integrity throughout the fastener

Key Features:

• Hex head design with reduced wrenching profile and wide-area flange
• Allows cylinder head retorquing without valve train removal
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings
• Undercut short bolts on select applications equalize stretch and compensate for head gasket compression
• Application-specific engineering for precise fit and alignment

ARP's exacting manufacturing tolerances ensure that cylinder heads and gaskets align perfectly during installation, eliminating the fitment issues common with inferior fasteners. Each component is manufactured to ARP's zero-defect, zero-failure quality standard, making these head bolts the choice of professional engine builders across all forms of motorsports.

This kit comes complete with all necessary fasteners and washers. Re-torque after initial engine operation to compensate for head gasket compression and ensure optimal sealing.