I have a 2015 Chevy Silverado 5.3 that has antifreeze coming out of exhaust bolt. I think my mechanic tap to deep while replacing old broken exhaust studs. I've been searching online for a fix. what i'm seeing is to possibly put something on the bolt that can handle high temp. can I get some help on this?
I would remove the bolt and see if antifreeze pours out. A thread locker product would probably seal the threads.
Found this service bulletin. I don't know if that is your problem? The fix is to replace cylinder head.
see If you are getting moisture on the oil cap where you add oil. Sounds like a blown head gasket. I doubt a tap would penetrate the head without extreme force.