I broke a stainless steel 3/8 bolt off at intake manifold. Machine shop used a diamond bit to remove it (after several attempts by me) and charged $75 or back then 1 hour labor. I use all grade 8 intake & exhaust with anti seize now. No problems since. Leland I'm going to use studs for the ex. on my next FE build though. It just sounds right! LOL.