ARP 154-3604 Cylinder Head Fasteners High Performance Hex Head Bolts - 8740

ARP 154-3604 high-performance cylinder head fasteners deliver professional-grade clamping force and reliability for demanding engine builds. These hex head bolts are manufactured from premium 8740 chrome moly steel and heat-treated to 200,000 psi tensile strength—significantly stronger than standard Grade 8 fasteners.

Advanced Manufacturing Process:

• Precision heat-treated using vertical rack method for complete, uniform heat penetration
• Centerless ground to exacting tolerances for near-perfect concentricity
• Thread rolled after heat-treat for approximately 1000% better fatigue strength
• Cold-forged construction ensures molecular integrity throughout the fastener

Key Features:

• Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
• Hex head design with wide-area flange eliminates valve train removal for retorquing
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings
• Undercut short bolts (where applicable) provide more stretch to compensate for gasket compression
• Application-specific engineering for optimal performance

Installation Benefits:

• Superior alignment—cylinder heads and gaskets glide into position easily
• Consistent, accurate torque loading for uniform clamping force
• Reduced risk of head gasket failure through optimized stretch characteristics
• Accommodates larger diameter valve springs with reduced wrenching profile

Each ARP fastener is manufactured to zero-defect, zero-failure quality standards and stamped with the ARP logo as assurance of authenticity. These head bolts are ideal for high-performance street engines and competition applications where cylinder head removal with the engine in-chassis is required. Kit includes all necessary fasteners and hardened washers for complete installation.