ARP 154-5401 Main Stud Kit Chrome Moly Steel - 2-Bolt 8740

The ARP 154-5401 2-Bolt Main Stud Kit delivers superior engine block reinforcement for high-performance applications. Engineered to eliminate main cap walk and fretting while protecting critical block threads, this kit provides the foundation for reliable high-horsepower builds. Each component is precision-manufactured from 8740 chrome moly steel and heat-treated to an impressive 200,000 psi tensile strength, significantly exceeding Grade 8 hardware specifications.

Key Features:

• 8740 chrome moly steel construction heat-treated to 200,000 psi tensile strength
• J-form threads rolled after heat-treat for 1000% greater strength than conventional threads
• Hardened parallel-ground washers and aerospace-quality nuts included
• Superior torque accuracy compared to bolts—studs don't twist during installation
• Reduces stress on engine block threads, extending block life especially in aluminum applications
• Simplifies engine assembly with consistent main cap alignment
• All clamping forces applied on a single axis for optimal load distribution

ARP manufactures every stud to exceed stringent aerospace specifications in their own facility, ensuring consistent quality and performance. This main stud kit is the preferred choice of professional engine builders who demand precision, reliability, and maximum clamping force in their builds.