Dropped my truck off lastnight for cold start knock, tech found broken exhaust stud he tried i get bolt out of head with no luck. Truck needs new head they are on backorder he claims my truck is on offroad status which will expedite a new head.
Oh man, I know what that is like. I work at a marina in N.Y. (salt water, of course) Have spent many hours trying to get broken (corroded) studs out of cylinder heads with no luck. Hope you get it back ASAP.