Minimum cylinder wall depth for a 318 stroker build

It's too thin. #s 1, 4, 5, and 8. I think too, your tester should be a little more specific. There is major thrust, and minor thrust, and checking a 5" tall cylinder in 3 spots isnt enough IMO to show a real trend. If that was in front of me with any performance work in mind beyond "stock with a cam" I would more than likely toss it and find another one.

Kudos on having the testing done tho. Much cheaper to find a "maybe" before you machine the whole thing...lol