Jeff,
just a lowly SF-110 here.
the repeatability is excellent, but i dont think it provides a very realistic comparison between heads with vastly different port cross sections, especially the bigger heads.
the lower test pressure, and with that, lower velocity, just isnt able to saturate the bigger heads, so gains that might be made from increases in cross section either dont show up....or hardly show at all.

it seems as though on heads that flow 300ish or less (@ 28") the numbers parallel the numbers from a SF600 pretty closely, but on something like a Dart 360 BBC head or a B1, the numbers just seem to be too low.

yes.....i know i could stand to have a bigger bench.