I know flow bench #s can't be compared DIRECTLY, but when they're using a common calibration standard you can expect they're going to be REASONABLY close.
Case in point....... I flowed one of the MCH CNC ported stealths about 5 years ago.....
.100---72
.200--159
.300--220
.400--266
.500--293
.600--309
.700--313
The thing that's almost never mentioned, and would have more of an impact on the higher lift flow, especially as the flow numbers get bigger......is the shape of the radius for the air inlet.
This can result in a 1-3% difference in flow(or more if its a particularly bad one) on the same head, on the same bench.
