I had a set of heads for my 300 C reworked. The heads were hot-tanked. The exhaust studs were not removed. Now, after the heads are installed, some of the studs leak anti-freeze. Apparently, the studs are drilled in the water jacket. I'm going to remove the studs and replace them. Does anyone know the proper way to seal the threads? Thanks in advance Vince [Non-text portions of this message have been removed]