Don's answer is right....it will be such a small amount. However, if you
canunlock 100 of the "small amounts" then you have a noticeable amount.

This is why some builders bore a new block....they're searching for tiny gains that will add up. Maybe they index the crank to a tighter tolerance, maybe they run the deck clearance just a tad tigher, maybe they improve the head flow by 1/2 percent.....they're looking for every bit that they can gain. For a street engine (regardless of how "racing" that it is), your street variables are too big (plug condition, fuel quality, jetting.

Dont waste the effort to bore a street engine until it needs to be bored