After reading countless proformance catalogs i am unable to find any domed pistons...Jegs, Summit, Doug Herbert, and Ross... nothing. Is it because of valve to piston clearence or that thay are already running a high compression as it is? Some time when my engine (390 FE) decides to kick out on me i'd like to up the compression a little more. I know that you can stroke it and i have considered that avenue. its a little bit more expensive though. Any ideas, or experince that you could pass on would be great!