ARP 154-5204 Main Cap Fasteners 4-Bolt Main Kit Chrome Moly

The ARP 154-5204 main cap fastener kit delivers professional-grade engine block security for high-performance and competition applications. This 4-bolt main kit addresses critical issues like main cap walk and fretting while protecting your engine block's threads from damage.

Key Features:

• Manufactured from premium 8740 chrome moly steel for exceptional strength and durability
• Heat-treated in-house to 200,000 psi tensile strength for maximum clamping force
• Precision J-form threads rolled after heat-treating provide 1000% stronger threads than conventional fasteners
• Forged construction with generous under-head radius reduces stress concentrations
• Hardened parallel-ground washers included for even load distribution
• Post heat-treat thread rolling extends fatigue life significantly over pre-threaded alternatives

This complete kit includes all necessary hardware to secure your main caps with confidence. ARP's advanced manufacturing process ensures each fastener meets the exacting standards required by professional engine builders. The rolled threads created after heat-treating maintain the material's full strength right to the core, while the precision grinding and forging processes deliver consistent, repeatable torque values for proper engine assembly.