ARP uses a premium grade 8740 alloy, rated far superior to 'aircraft' quality, for their Pro Series cylinder head studs.
Each stud is vertically placed in special racks and precisely heat-treated to 200,000 psi for complete heat penetration.
The studs are then centerless ground to achieve perfect concentricity, unlike lesser quality studs.
Because ARP studs are manufactured to such exacting tolerances, gaskets and cylinder heads literally glide into position and are perfectly aligned—something that won't occur with inferior quality head studs.
By being thread rolled after heat-treat, these studs have about 1000% (that's ten times) better fatigue strength than those that are threaded prior to heat-treat, a very common industry practice.
It costs significantly more to do it this way, as it's tough on tooling, but the results justify the extra effort.
This cylinder head stud kit comes complete with premium quality parallel ground washers and conventional hex style nuts for select Ford small block applications (289-302 with 351W head, 7/16'-14 cylinder block thread M-6049-J302, SVO high port and M-6049-L302, AFR 185 Edelbrock aluminum, GT-40 style with insert 'T' washer).
