I used Milodon head studs on one engine trying to save my customer some money. Broke one stud on installation. They told me they had a bad run and sent me 3 new ones (sbc) as they didn't know which I needed. Good thing they sent 3 as on first warm up a second stud broke. Replaced that stud and the engine was raced a full season. Upon tear down a third stud broke!!! NEVER AGAIN. I use nothing but ARP studs in my customers builds from then on.