ARP uses a premium grade 8740 alloy, rated far superior to 'aircraft' quality, for their cylinder head studs in the Pro Series.
Each stud is placed in special racks vertically and is 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 will literally glide into position and align perfectly—something that won't occur with inferior quality head studs.
By being thread rolled after heat-treat, these studs possess about 1000% (ten times) better fatigue strength than those that are threaded prior to heat-treat, a common industry practice.
It costs significantly more to do it this way due to the strain on tooling, but the results justify the extra effort.
This cylinder head stud kit includes premium quality parallel ground washers and conventional hex style nuts for select Chrysler big block applications (Mopar B, RB and 413-426 Wedge, Edelbrock RPM).
