Safe to bore a 383 60 over?

You can see how much bigger the large probe is. That's important too, because believe it or not it makes a pretty big difference in the readings. Also, We looked and looked and can find no evidence of where it's made. The ad said it was "Made in USA" and we both feel like the quality is there, but there's no proof and since it seems to be generic in nature, it's probably not. It works well enough for measuring cylinder wall thickness, though and it does it really accurately.