Highest flowing sbm heads?

pittsburghracer said
You guys keep thinking and saying this. Lol

And proving it. For decades. That’s why two heads can flow say…300 CFM and one kicks the **** out of the other.

There is way more to making horsepower than just flow. Port shape is just as important (maybe more so) than flow.

How the port flows in reverse is just as important as how it flows in its normal direction