I have been having issues with disappearing coolant. The overflow container was cracked and I did the simple green coolant flush(oops, the concentrate got used, I didn't read the label) it worked fine, has sodium carbonate which is fine. Washing soda remove rust and fries out funguses that may be growing in hydrocarbons. One head was cracked, the other was warped but got milled.Watch. the new one is sweating and I'm going to dip it because I'm trying to imply a reality that I don't believe is defined by the swollen greasy cylinder head. I don't think this to be forged in fire and ice and it's just iron.