Being the very, very, very part time junior machinist that I am let me ask:
I understand in the perfect world that you would want to cut/hone all 4 caps at the same time to keep them aligned, I would think that if the bar was set via the other three surfaces you could reasonably assure tolerance on the 4th.
Since this is the front cap that is less than ideal (the intermediate caps would be a much better candidate) but any manufacturing process would allow for tolerances that would provide for a reasonably successfully outcome.
As I said, new block is the preferred repair... but for a matching numbers motor that may not be always desirable.
