If you increase the bore on your 350 v8 does that mean new pistons and rings?

Answer 1

Yes. Boring the cylinders means that you have made the hole bigger. Although it's only a few thousandths of an inch difference, that is quite a lot when the piston is traveling through there HOPEFULLY for a long time. If you bore the cylinder without putting in the appropriate sized pistons & rings you will have NO compression and the engine won't run, and even if it did, it would wear out VERY quickly. So, YES, you do need to put in new pistons and rings when you bore the cylinders. And while you're at it, if you live in a high altitude (4,000 ft elevation or above) you can usually select pistons that will raise your compression by 1 point without causing trouble for the computer.