LOL. Giving a head a chance to continue it's life on your engine. What would be a good permanent fix for a rear freeze plug on a head that is damaged? The PO put a expanding rubber plug in it and called it good. Not my style. I want a permanent solution that looks good. It appears that someone ground down the plug boss but ran out of real estate before arriving at a sealable plug shape. How to build this back up? Discuss please. First pic is the drivers side undamaged head.