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Beside the red highlighted factory hole is another hole that measures 3/4".The one that faces the front is 1". I'm going to plug them.I have a fluid film spray gun that has a hose attachment to spray into a cavity like this for rust prevention.

Anyone else have these holes in there abody?I don't recall them in my demon and it's not here to look at. I'm replacing the heater core and it's mice heaven in there.