Lost Frost plugs

I would recommend pulling the engine and going over it to make sure.


If the cup plugs just fell out, then there is something wrong. They are interference fit and don't just fall out....

I would check the hole size to make sure that it is not too big or the cup plugs to make sure that they are not too small. The plugs don't just fall out on their own.

I would also check the other plugs to make sure that they are ok...

Loctite will also make them hold better and less prone to "fall out" again.