Core/Freeze Plug blow out

Thank you for the responses.

I made sure the surface was clean and dry. No pits or rust issues.

No socket used on the install. I bought a plug installer tool and am driving them in by the edge. I am using Permatex 2 on the edges of the plug.

Yep. Plug popped out when I got on it. No overheating issues. I am going to pick up a couple of the larger plugs and see if they fit better.