Why is ther no formula to figure out port volume?

This is where good R&D and CAD-CAM is so valuable. I know that not everyone has the oppertunity to get this info as it doesn't come cheap, or the years of experience of doing. And some things are trial and error and you stumble on things, but this is how we learn. Thats why I like what I do as I get to paly all day long if need be. I like to think of it as a dream job that I made a reality. I'm sure there are many more out there that are doing the same thing.

Moper, the difference is how well the machining is done that will either make or break a engine setup. I'm sure that you have seen this also.