Don't read if you're close minded

RAMM said

This B.S. about wanting 0 vac comes from the Nascar world and only applies to them. If I saw actual 0 vac on a carb the engine would not be able to run as there is no fuel flow either. In fact I believe and know that better atomization occurs in more vacuum. Its not just velocity created by a smaller carb , its the increased vac in the intake tract that vaporizes the fuel and also lowers the intake tract air temp. I've just pointed out 3 things going on when moving to a smaller carb. J.Rob

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When I said least restriction, I didn't mean no restrictions, I meant generally the least restriction that will perform how you want. Whatever that want is.

Eg. Say 650 gives you everything you want a 750 would only gain a couple of hp and a 500 kills 20 and gives a similar experience driveability wise. To me the 650 would be the least restriction that gives you what you want, but now lets say the 750 actually gains 15 hp across the meat of the powerband but gives up some driveability, now some wouldn't overly care about the driveability so the 750 is the choice and for other on the same combo would prefer the 650 but there's no reason to choose the 500. The choice is depending on what's needed/wanted 650 vs 750.