I did find out that a carb spacer on a port with a big step seems to do pretty much the same as clay radius. Still going to make a better solid entry using one of those router bits (luckily dad has a Festool fetish and whole collection of Tungsten tipped router bits).
And i should see if adding a radius on the intake of the vacuum motor does anything positive
as an aside.
I can attest to the reduced spitback of the bellmouth as Blair describes. While testing a engine with a cam timing all wrong due to ridiculous chai stretch it had some standoff. Dyno guy wanted to take it off.I stated that according to Blair it would be worse. Still took it off and then it started to belch out whole clouds of gasoline like Victoria falls... had a milisecond victory moment in silence
