Hello,
You have one of two things going on here. Either the guides in that cylinder are worn or moving around OR the steel inserts in the coolant passages are very heavily corroded and are now big holes that are leaking coolant into the cylinder which is being burnt.
Check this:
1.Open the radiator cap on a cold engine, start it and see if coolant now burps out of the radiator filler neck, if not, then fit cap and tighten down and see if pressure builds up immediately in the system, try to squeeze the upper hose.
2.Check the valve lash on #2 a few times to see if it changes as the engine is run.
Hope that is some help.
I would still suspect the coolant leak angle. The heads on these engines have steel inserts in the waterways that causes galvanic corrosion and the holes become huge craters that evetually blow into the combustion chamber.

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Nachi11744