I have no flow # on mine. I have gone 9.76@135 with a 1.34 60 ft in my Dart. These heads are 2.14/1.81 that have been ported, had a lot of work in spring pockets and push rod area. Matt

70 Dart 3400 496 New Best 6.15@110.37 660ft, 9.76@135 with a 1.34 60ft