Okay; Sorry my message was somehow offensive. I'll try to not do that again.
Who knows; he might not have been able to get the unswept volume small enough without milling the block, anyway, so it may well be moot.
I would think that if he's going to bother to buy custom/forged pistons, the manufacturer could probably give him any compression-ratio he needed, with a dome. That would negate the necessity of milling anything, wouldn't it?
