W2 head porting observations help needed!

PRH said
That seems like a situation where the risk/reward ratio is pretty unfavorable.
Personally, I’d set a pretty easily attainable goal, especially since at this point it doesn’t appear that you’ll be able to use your numbers to gauge where you really are .......compared to the potential of the head(you don’t know what a “300cfm” w2 flows on your bench).
You’ve picked them up 15% already.

Use some scrap J head or something for the learning tool, and save the W2’s until you have a better handle on how your numbers translate to the rest of the world.

Yeah, I totally agree, I think the gain I've made so far is a step in the right direction, and a good stopping point....the other, newer W2s are mine, and I know the are a bit better as cast, I think I'll spend my efforts on them, after I get a handle on the bench calibration. Its within 4 CFM of the calibration plate that came with it, but I dont think the vaccum source is enough to keep up at the higher flow points.