I don't have Flow #'s but I ran 11.00s e.t. @ 123mph on motor. And 10.00's @ 134 (Nitrous Big Shot Plate 225hp shot) ,mph with a 440. 30.over. 10:0-1CR 906 heads( hand home port) with hyd cam 509' stock steel stamped rocker arms , wiend intake 825cfm carb (worked) 727 trans. 3500 stall 9 1/2" coverter.... 8 3/4 391G ratio on foot brake, NO Trans Brake. In an A-Body (Duster) @ 3,400lb Race weight...wish I had them Flowed but didn't.... If anyone can give there on what could be the flow#s by the 411 Im giving here...Thanks...