I recently finished flow testing two cylinder heads.  One of them is a severely damaged head that I intend to use as a test mule, and the other is my good head that is in pristine condition.  Since this post was originally intended to capture baseline data on the LS650 cylinder head, it seems appropriate that I post the flow test results here.  I also will be posting the data to my post in the tech section along with information on the budget flow bench.  The following graphs provide the flow data for the intake and exhaust ports on the pristine head, however, both heads flowed about the same.

Looks like our stock heads flow about 150 CFM intake and 93 CFM exhaust corrected to 10" H2O.  The flow bias is about 62%.  These numbers aren't perfect as my budget bench isn't calibrated, but it does treat all test specimens equally so it's a good tool to measure improvements.  I imagine the little contraption isn't too far off.  Check out the update in the tech section to get the specifics on the changes to the bench and the test procedures.