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OK, a couple more questions. Side pipes are off the car and passenger side header is off too with plugs pulled. I'm still thinking #6 is the culprit. #5&6 cylinders build same pressure on compression tester (cold) for what its worth (~150+ psi) I'm thinking at temp and load a small leak can still be opening up vs cold. The temp will jump when I hit the go pedal (for 3-4 seconds) on the highway almost instantly, then cool slowly.
Tonight I put a pressure tester on the radiator, its holding like a jug. I do have a big exhaust leak on the header (#6) up next to the head. Lots of soot on the flange of the header. I know the exhaust blows out, but can you suck air in there as well to clean all the soot from that header tube as well as thru the collector on the sidepipe. Thats the white tube I showed earlier. Oh yea, on the exhaust port itself, there is what looks like a white scale deposit on the lower side of the port, like water sitting there leaving a deposit. All other exhaust ports are just black.
Just trying to be 110% sure the head needs to come off.
Mat
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