Afternoon, Klaus,
With your encouragement I tackled the lower coolant pipe bolt again and this time I successfully extracted it.
Still can't get any motion on the head at the back but I can raise the front about an eighth of an inch.
I did disconnect the aft coolant pipe at the rubber hose but that did not bring me anything. The metal pipe is entering both the head and the engine so I cannot pull it away.
I did not give the exhaust studs a try yet because I do not seem to have any extra metric nuts around to create the jam nut. I would like to use fresh nuts rather than the original bolts.
Happy to make a little progress today.
Bob
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