1974 250

[dawg]

Their are 16 holes 3/16 dia on the inside of the head just out side the dome area. They are on 3.462 dia. bc . That puts them under the head gasket but just on the outer side of the metal ring of the gasket. Some heads have them and some don't ! What is the purpose or design for these holes? I have had many people guess as to why they are their but does anyone know for sure?