[P.S.]

I know you guys are just trying to be helpful, and I thank you.

However, I am most positive that it is combistion gases blowing into the coolant. No question. That is fact. Otherwise, I wouldn't have said it.

Fordbarn forum can be a blessing and a curse at the same time. Someone comes on here and says their steering is loose and there is always someone quick to tell them their timing is off.