these are my numbers. they are mopar aluminum heads, probably purchased in 2005 or something like that, so not the new edelbrock castings.

before:

In Ex
.300 213 198
.400 254 205
.500 276 205
.600 287 205
.700 290 205

after a mild port job:

In Ex
.300 235 225
.400 284 229
.500 317 232
.600 329 234
.700 337 236

pretty easy to see that these heads flow similar or worse than stock heads. hard to imagine they would put all the effort into casting a head, and not even improve the one critical issue: flow.

anyway, just for comparison.