Bore Gauge Help

When i said the ridge was standard bore...maybe I shouldda said unworn instead. That's all I meant. You're gettin some fine advice here. Spcially the pistin location thing. I've always been a bit more forgiving because of budget constraints with my personal stuff. I've run a lot of engines with bore and piston wear out of spec and believe it or not, those were some of the best running engines. As long as you buy rings accordingly and file fit them back to spec, an engine like that will run better and longer than you think.....although it is not the correct way. I'll add this......i built my first engine in 1976. Been doin it ever since. Not one single time have I ever removed a ridge in all that time and I've never broken a ring or never had any trouble whatsoever. I've torn down some pretty sloppy engines, too.