This document provides an overview of the various head stud options available for the 6.2L engine, focusing on the ARP 8740 and ARP 2000 head studs. It discusses their specifications, torque recommendations, and the advantages of using these high-quality components in high-performance applications.

The original 6.2L head stud, ARP Part # 130-4062, is manufactured from 8740 chromoly material. This particular stud has been a reliable choice for many years and continues to be utilized due to its proven performance. According to ARP, the recommended torque for the 130-4062 head studs is 90 lb-ft. When torqued to this specification, these studs achieve a clamp load of approximately 180,000 psi. If torqued to 125 lb-ft, the clamp load increases to 200,000 psi.

While ARP recommends a torque of 90 lb-ft for the 130-4062 studs, it is important to note that they begin to stretch at 100 lb-ft. In practice, many users have torqued them to 125 lb-ft; however, this can lead to one-time use due to stretching. Extensive testing has shown that if a solid head stud can withstand 125 lb-ft, it significantly reduces the likelihood of blowing a head gasket, especially when paired with Cometic MLS gaskets. The combination of a robust gasket and a stronger stud package contributes to this reliability.

In our tests, the ARP 2000 Pro head studs, when torqued to 125 lb-ft, produced an impressive clamp load of 430,000 psi. This means that at the same torque specification, the ARP 2000 studs provide over double the effective clamp load compared to the 8740 studs, all without adding extra stress to the engine block.

This remarkable performance is the reason we developed the ARP 2000 Pro head stud upgrade, which we believe represents a bright future for the 6.2/6.5 community without blown head gaskets.

Various other brands of head studs have been available for many years and gained popularity, particularly after ARP experienced shortages in 2020. However, we strongly advise against using these alternative brands for high-compression IDI diesel engines. We firmly believe that ARP should be your only choice unless you are using factory TTY bolts.