ARP 291-5802 Main Stud Kit Chrome Moly - 4-Bolt 12-Point

The ARP 291-5802 main stud kit is engineered to eliminate main cap walk and fretting while protecting engine block threads in high-performance applications. This 4-bolt main configuration features 12-point heads for optimal torque distribution and easy installation.

Key Features:

• Manufactured from 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-treat, delivering 1000% stronger threads than conventional fasteners
• 12-point head design allows for precise torque application in tight spaces
• Includes hardened parallel-ground washers and high-quality nuts
• Select applications include specially designed standoff studs with serrated lock nuts for windage tray mounting

ARP main studs provide superior clamping force compared to factory bolts, ensuring the main caps remain precisely located under extreme loads. The rolled threads after heat-treating process creates a fastener with significantly extended fatigue life, making this kit ideal for both street performance and competition engines. Each component is manufactured to exacting tolerances to meet the demanding standards of professional engine builders.