Missed on this combo?

So if they are flowing within 10%, they could be flowing 284cfm @ .650"? Or is it 274cfm @ .650"? Which heads really? The big mouth heads are listed at 316cfm @ .650 and the fully cnc'd heads are 304cfm @ .650". 90% of those flows is......well......284 or 274.

Not that it isn't the cam, just wondering.