There is a piece of clothe hanger type wire that is inside the head itself. I just had mine rebuilt, with new freeze plugs, and they left this piece in there. I think it is in there for some reason in the manufacturing process. I am not sure if it can be removed or not. My heads are from a 72 360. Maybe someone can enlighten us on what they these rods are there for. I do not think they hurt anything.
Ignorance is the first step to knowledge.