It looks like the flow numbers are a little low on the CNC speed master heads posted for comparison, too. The effort on the Mullen heads does appear to be concentrated on the low lift flow. But it’s still preliminary as the valve seats need reworked to get them back to optimal. More to come, and many thanks to Chris for sharing! FWIW I’ll post up Mullen’s flow numbers from the Direct Connection “White Book” after I dig them out. To complicate matters there, the flow numbers are taken at a very low depression with the bench technology from 1975, so corrective formulas have to be applied for comparison. Even then, with such a large factor of correction at play, the margin of error will be on the high side for a true “apples to apples” comparison, but it does give some idea of what the heads flowed as delivered.
