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All kits come with aerospace-quality nuts and parallel-ground, hardened washers. Kits include undercut short studs that all but eliminate head gasket failure. Undercut studs have a narrowed area on the center of the stud shank. These undercuts add more tensile strength to the stud. 190,000 PSI.
Performance engine builders know that head studs are superior to bolts, and this is especially the case on Flathead Ford and Mercury V8s. Flathead decks are thin and their threads are easily stripped. By installing studs, you avoid damaging the threads in the block through repeated use. The combination of the studs' fine outer threads and hardened washers also prevents galling and ensures accurate torque readings, particularly on aluminum heads.
Highly recommended for all 1939-53 Flathead Ford/Mercury with aluminum heads. Flathead decks are thin and their threads are easily stripped. The outer end of these Grade 8 studs have fine threads and with the hardened washers (included) which prevent galling and ensure accurate torque readings.
190,000 PSI studs will keep your motor together.These ARP fasteners are second to none. Don't have stock bolts let you down when you least expect it.