Hello
I think one digit is shiftet. I remeber 60, 000 to 60,020 with 0,030 as final wear area.
Now it looks like you hace the first overbore with is plus 0,25 mm
The tolerances where then 6,250 to 6,270
The 60,300 would be on the border.
Mostly the bores get slight oval over the years and the middle bearing is the first to show signs for that.
So you have to mesure crosswise to get a middle messure field.
Just look at your books what numbers are the correct numbers as I only know the "fields".
If you go to make a normal engine the tolerances are OK but if you bild up a tuning engine or will go to race then the case needs a new aligne bore up to 60,500.
Grüsse
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