I am getting ready to rebuild the engine in my 88 F250 and would like to raise the compression ratio at least one point, PAW shows compression ratios based on combustion chamber size.....but how do I find out what size chambers are on these heads??? Also, what effect will the higher compression ratio have on my computer? I think I can use forged flat-tops to get there, but I don't want to spend that much money and creat problems for my self. Thanks, Tiler.