Horse Power Potential of Cylinder Heads

The Superflow formula is 2.06 hp per CFM exactly. That means the head flows enough to support that hp number but only if the combo is right. My 340 Duster went 12.25 @ 110.71 with 915 ported castings 2.02/1.600 valves Mopar 528 mechanical cam . The heads flowed 232 @ .525 You can do good things with stock heads but aftermarket has much more potential. JFYI .

Terry