ARP uses a premium grade 8740 alloy, rated far superior to 'aircraft' quality, for their Pro Series cylinder head studs.
Each stud is heat-treated precisely to 200,000 psi in special racks to ensure complete heat penetration.
Unlike lesser quality studs, the studs are centerless ground to make them as close to perfectly concentric as possible.
Because ARP studs are manufactured to such exacting tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned -- something that won't happen with inferior quality head studs.
These studs have about 1000% (that's ten times) better fatigue strength than those studs that are threaded prior to heat-treat, a very common industry practice, because they are thread rolled after heat-treat.
It costs a lot more to do it this way, because it's tough on tooling, but the results are well worth the extra effort.
This cylinder head stud kit comes complete with premium quality parallel ground washers and conventional hex style nuts for select Chevrolet big block applications (Late Bowtie, Dart Merlin, iron and aluminum Dart 360, Edelbrock, Dart Pro 1).
