Thread: Quadrajet

Tweet

Originally posted by dr_bowtie
even the very smallest of Q-jets were 750cfm and these came on everyday 327's...the gen II 795cfm unit is better unit...Either unit will have better off idle throttle responce due to the smaller primaries.....

I have said this before....You really canot over carb and engine, The engine will only take what it needs, due to the vacuum pulling thru the carb...derminded by its displacement...

The engine does not know what carb it has on it nor does it care...It does care if it is set right for it to use!

the smaller Q-jets was around 560 or 580, i don't know exactly what it was but it wont 750. and I know what you have been saying about what carb to run and there might be some people here that will believe you and bolt on a carb that's to big for them. if what you're saying is true you wouldn't need but one carb. a predator is a verbal Ventura and will do what you say, but that's the only one. I cant imagine where you come up with this idea, because its not true and never has been. the formula for finding the right carb.for a is engine CFM = (engine CID x max rpm x volumetric efficiency)/3456 with the volumetric efficiency being about 85% with stock stuff and will go up some with a dif heads and cam, still under 100 %. anything bigger than this formula says is to big. this is for all around driving. at the strip at WOT all the time you could use something a little bigger, but not much. take a 400 CID x 6000 RPM x 100% volumetric efficiency / 3456= would need less than a 700 cfm carb and this is a formula that been used by just about everyone. if you're running as good as you say you are bolting just any carb on you motors then I hate to think how fast you could go with the right carb.