[totle]

My rebuild was more a top-end rebuild. The engine case was not opened, so the through-bolts was never touched. That means they have the old o-rings.

To me it looks like the base gasket on this cylinder is more protruding than on the other cylinders.

The engine is still in the car. Does not have the time to drop it yet. To many other projects going on.
Good tip about the brake-cleaner. Will clean properly later today and see if I can figure out where the leak is coming from.
Very tight under there and the cylinder tin is in the way of viewing