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There shouldn't be much need for room in the revision block. The exact changes to the drawing should be identified in the Engineering Change Request or the Engineering Change Order and Notice. I know some companies like to use the block as a detailed reverse list record of every little change, but I think it's a waste of time to do so. In the past it wasn't possible to have more than one original of a drawing and a limit on the number of copies, but with CAD that is no longer true, so if one wants to see what the old drawing was like, take a look.
Most of the time, when pressed to include this excess data, I just make the text a little smaller or increase the row height.
I think there is no ASME drawing guidance on this level of detail.
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