Recently I have been talking about building a sbc motor (400) and it was commented that boring out the cylinders just refreshes the cylinders and doesn't add any HP. I may add the argument made was very good.

I am very curious on what you all think about this subject, I see guys rebuilding thier engines of all kinds and alot (most) mention .030 over or more of boring.

My question was if your increasing your cylinder volume, arn't you gaining hp?

So let me know what you all think, inquiring minds want to know?