I am working on my little brothers car and it had been over heating checked the oil and was milkiyish on dip stick some one told me head gaskets well I just tore it down and took the heads off and the gaskets look old but not cracked or have holes in them was told it could be the block is there a way to check this with out putting the car all back together with new head gaskets. Or any other options on what it could be befor put it back together to find out I need to tear it down again