For serious engine builders, ARP main studs are the gold standard. This 4-bolt main stud kit (part #1355601) is manufactured from 8740 chrome moly steel and heat-treated to a massive 200,000 psi tensile strength - way stronger than standard Grade 8 hardware. The threads are J-form rolled after heat-treating, making them 1000% stronger than cut threads. Why use studs instead of bolts? Studs eliminate main cap walk and fretting, provide more accurate torque readings (since they don't twist into the block), put less stress on block threads (crucial for aluminum blocks), and make engine assembly easier with proper cap alignment every time. The kit comes complete with hardened parallel-ground washers and aerospace-quality nuts. ARP makes their fasteners in-house to exceed strict aerospace specs. Whether you're building a high-performance engine, a race motor, or just want the strongest possible bottom end, these main studs are a top choice. They're trusted by professional engine builders worldwide. Invest in ARP studs for peace of mind and superior clamping force.
