Hi Billydon, most likely is you had the head gasket loosen up and was pushing the compression into the water jackets, before you took the head off you should have checked the torque of the head bolts to see if they were at the proper torque#. there is 100 lbs. or more of compression in the cyl.and in the water there is only 13 or so of pressure. so if the head loosened up you will push compression into the water, that will turn the fluid yellow for sure, not having signs of water into the cyl, chambers, and the machine shop says the head is not cracked and is flat is a good thing, clean everything up and install new gasket and try again if you don't find any cracks, its hard to see in your pictures if there was a gasket problem. you didn't have any water dripping from the tale pipe and 200 degs. is really not that hot and maybe your thermostat stuck, did it boil over out of the radiator? if not put it back together , replace the thermostat.
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