I had a set of SR M.W ports that flowed 340 @ .700, I also had a set of MCH CNC ported 440-1 that flowed 370 @ .700 on the same flow bench by the same tech. On my bracket race RB stock block 526 C.I.motor the 440-1 heads made 70 HP more than the SRs did, on my pump gas 518 C.I. 400 stroker motor the 440-1 made 50 HP more than the SR did