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Mine is about 5 years old, so it probably wouldn't qualify as an "old" Norton, but the 4K was quite textured when I got it. It had sort a linear pattern on the surface and was fairly porous and...

If the 4K side of your stone feels nice and smooth with no granularity in the surface you are probably good to go. With my Norton 4/8 I had to lap about an eighth of an inch off of the 4K side to get...