Sometimes... I think you have to stop overthinking and get back to the basics. My 7710 was on cook all of the spring season last year. I blew the rad out. I tightened the belts. I drained and flushed the block/rad with a phosphoric acid solution... I was down to the point I thought either the broken fan shroud was causing the problem or the water pump impeller was worn out. When I finally pulled the nose off to do some work on the air cleaner... and pulled the coolers out... I realised that the rad was blocked SOLID. Not with chaff or pollen or dust as it usually is... with hard caked soot that was getting drawn in there from an exhaust leak. It literally took more than half a day to blow and wash that mess out. Now it runs as cool as it ever did and I still haven't installed the new shroud...
It seems to me that your problem may be related. SO look real close at it. Get it good and clean. Then drain her out and get that crap out that you dumped in last week and run a phosphoric acid flush through her... and triple rinse to get all of that out or wash until the suds/bubbles stop. You'll be amazed at what garbage a commercial fast flush product will remove that vinegar will not remove. Then refill and see how things go. I'm a little concerned about the bubbles you're getting occasionally... but given the temperature it was at that may not be surprising. Most times I've seen head gaskets fail on Ford engines (and I've had a few) they continue puking until they puke enough/all of their coolant, THEN they run hot. I've yet to see one run hot while it's actively puking coolant. If you open the cap it will blow the cap off in your hand and often form a geyser of black froth. The coolant will be absolutely black, oily and foaming... I think you just have a hot engine from lack of cooling capacity.
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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