Once you start bumping up compression, you REALLY see gains.
Look @ J-HILTS build, 75HP I believe he was making. Stock bore 14:1 compression :grin_nod:
But you really have to think about what works for you. After 11:1 you'll start needing to mix race gas and regular.
And only gets worse. Once you go farther than 12.5:1 you'll be needing 110.
If you have cash to spend on gas, and you're looking for HP, bumping up compression is really the way to go.
If you're looking for power while staying pump gas, boring and staying lower comression is the route.