I have a set of MW port Indy SR heads thatone intake port flows 336 cfm at .600 lift at 28 inches on a Super flow 600 bench and the same port on the other head flows 325 CFm at the same lift ansd so on. The exhaust ports flow 215 and 220 cfm at .600 lift at 28 inches on the same bench. I have two other sets of flow sheets from two different flow benches and they show less flow on the same ports at the same lift and inches of water on there flow benches. I guess a guy should remember that we don't race flow benches and not all flow benches (and operators) flow the same on the same cyl. head and ports. IHTHs. See the attachment, sorry it's not a better quality.