Dam it must have taken a massive effort to compile all that data.
There are some numbers listed for the standard 340 iron head which could be an X heads. If true the air flow numbers are a lot higher then I would have expected 189/142 @ .600
usually it will have valve size and if ported who did it. I don’t hold it as gospel but it does give you an idea. And yes he did put a lot of work in that.
