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It's been awhile since I've performed it....so I can't remember the specifics....but if you have the freeze plugs out, you can in most cases see how thick the cylinder wall castings are by sticking a drill bit in between the cylinders through the freeze plug hole.
Now if I remember correctly, if you can fit a 15/32" drill between the cylinders, then the castings aren't thick enough to bore a lot out of them.
You can do a search on drill bit test and probably find out more. Like I said, it's been about a year since I've messed with an FE.....and I was using it to see if a 390 block I had was thick in the cylinder walls or not....
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