Whenever I see someone selling a freshly rebuilt motor that says it is stock bore, I get suspicious about whether the bore was measured, or if it was put together out of spec just to save the cost of machine work and new pistons.

By the time a Honda motor gets to 75,000 miles or so, it seems there is always a cyclinder or two oversized or ovaled enough to require a bore job to get all within spec. Yet there are so many rebuilt motors around that are heading into 300,000 mile territory with the original bores.

Those who opt just to hone, could end up with even sloppier bores, as it is easy to take off a lot of metal fast from a Honda bore using a CK10 or other pro hone, even with a 400 or 500 grit stone (and if you don't ask, you may find a guy planning on using a 320 stone on your Honda, which is a sign he doesn't know Hondas). A worn stone will also create uneven bores in the Honda, whereas it would be fine on a V8 Chevy block.

An engine is nothing but a giant air compressor pump (with fuel/air explosions), and the better it seals, the more air it pumps and the better it will run.