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I made some modifications to intake port of old SBC dart 2 heads. I did get much improvent in flow numbers, but at certain point of modifications the sound of flow went very pulsating. I drilled pushrodhole bigger, loctited metal sleeve in and grinded "bump" of pushrodhole at intake port so sleeve came to visible. Then I smoothed grinding. The sound went back to very smooth, it wasn't pulsating anymore. Flow did get only small improvent at high lift (where pulsating sound occured), but I think if I had continued porting, this would been a limiting area. I must continue that project someday, when I have time for it.
I don't mean area of intake manifold face is too small (actually, I think it is too big.), but a "bump" of pushrodhole of dart 2 is very big. So was it creating some vortex or something?
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