Thanks for the input guys. Unfortunately I think the lifting of the head will be unavoidable d/t the low compression of the fifth cylinder. I'll just take it as it comes.
I hope my scenario is the same as Aklim and his gasser car. Cleaning sounds better than repairing physical damage!
I might post the findings in a few days.
Frankie

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Frankie
It never ends!
1985 300D Turbo 181K Anthracite grey, "SOPHIA"
1984 300 SD Turbo(sold)
2004 Subaru Forester XT,Cayenne red.