Do Carter's really only need 3psi max????

I was curious because i was watching videos on carbs on youtube and kept running across a guy the makes a point of saying "caters need 3psi max" like he's getting paid to say it. Myth? I have a 500cfm and its pulling 6psi after the filter and 8 around 65. Could to much PSI within reason cause flooding/bad mileage??


Thanks!!!

Jake