quadraget CFM on a L48 Motor

looking for the cfm rating on my 1973 L48 quadrajet, anyone know where I can find the info?

Most of them are in the 600-650 range.

Here's some info:

https://www.youtube.com/watch?v=xuqz5Bs96Tw

https://en.wikipedia.org/wiki/Quadrajet


Some reading:

https://www.motorstate.com/Quadrajet.htm

Hope this helps. Basically the Q-jet is a variable CFM carb up to the maximum of either 750 or 800.  The 800s are fairly rare.


|UPDATED|7/15/2017 6:42:26 PM (AZT)|/UPDATED|

thanks for the information, I am in the process of rebuilding mine and am not having much luck right now. seems to be an issue with the power valve because when I adjust the mixture screws not much happens.  

There's a couple of good books on Qjets, one by HP books and the other by Cliff Ruggles.

At idle the power valve should be down unless there's a vacuum problem.  A good cleanup and rebuild will probably take care of the problem unless there's a vacuum leak somewhere else.  It's surprising (at least to me) how little air an engine uses at idle so a minor leak can have a large effect..

Make sure your primary throttle shaft doesn't have any up, down, front to rear play in it. This will be a source of a vacuum leak. If it does, there is a bushing kit out there that will fix that problem. Very common with Q-jets, especially 4 speed car because of being on and off the gas pedal between shifts. 

Good point.  But it happens to Holleys also.  I bushed my friend's '66 427 Holley.  Really helped.  The kit came w/ a reamer and bushings.