PKRWUD has a ton of real experiance diggin around in engines, and you'd be better off having him help you with building stuff up. He's got the facilities to work on that kind of stuff, and he knows what he's doing.
I hate Rice a dished piston is exactly what you think. It's a concave piston which drops the compression ratio. Dished pistons are beneficial in a couple different circumstances, most notably, high boosted applications. In those circumstances, you want the compression ratio lower to allow for a higher boost level. It also comes in handy on some of the older cars that had very high compression ratios, that maybe you want to run on 87octane pump gas now. Installing dished pistons will drop the CR way down, and allow you to do that.
For a naturally aspirated engine, no real benefits come to mind. Heh, maybe you wouldn't need to flycut? LOL!!
[This message has been edited by Unit 5302 (edited 10-06-2001).]