i just did another set of 440-1 heads using a 2.250 valve on a 4.380 bore using indy's cnc casting which has a very small port in it so you can do what you want, at .400 they flowed 292, at .600 they flowed 359, 375 at .700 and 381 at .800.. the exh flowed 211 at .400, 242 at .500, 263 at .600, 279 at .700, 291 at .800,, 311 with a tube on it at .800.
