Yes good points indeed, the 350 picks up 5 ci, the 400 picks up 6 ci and so on. A 383 cannot be a 383 unless the 350 is bored 30 over as well. I checked the comp ratio calculator and that is a good rule of thumb for boring, its close but not so accurate as to actually know it without calculating but it works close enough. Thanks Denny, I'll remember that stuff.