W2 head porting observations help needed!

replicaracer43 said

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.

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If your vacuum source isn't strong enough then you won't be able to maintain 28" of depression past a certain flow rate. Check what they flow at 20" h20 and convert to 28" . Play around with it.

W2's flow 234-235 cfm out of the box on my bench and a SF-600 local to me. They don't flow near what MP claims without work. The bowl shape is great, the port size is enough for most applications . The shortside is tricky. You can get great low lift and high lift flow numbers if you get it just right. .020-.030" too much in the wrong place and a poor flowing port at all lifts will result. J.Rob