Alcohol Quadrajet

[SHABS]

Is it possible? Can it be done? I'm looking at the price difference in a Holley 750 and a Quadrajet 750.... Still want to be on alcohol. 406 SBC, 3,500 lb car, glide.... Is it possible?

[Ethan1]

Is it possible? Can it be done? I'm looking at the price difference in a Holley 750 and a Quadrajet 750.... Still want to be on alcohol. 406 SBC, 3,500 lb car, glide.... Is it possible?

 Welcome to CHP!

 You have a good question. Cliff would be the best to answer this.

[Cliff Ruggles]

We have quite a few customers using E-85, non using straight alcohol that I know of.

Our parts hold up fine in E-85.  Calibrations are quite different from stock set-ups.  Typically takes about 30-35 percent more E-85 to do the same thing as pump gas.....Cliff

[AnotherMOPAR]

Not to high jack this thread, but it seemed the most applicable one to my question. I've got a spare qjet I was playing with the idea of alcohol with...as a general practice a sized up most of the passages pertaining to fuel about 20% larger.
I know this is not substantial for e85 in comparison to the carbs original measurements (Cliff you suggested 30-35%).
I am not next to my notes for this specific carb to recount exactly what I've done thus far in what areas; will add later.
My question is, what has been the longevity and average mpg after the e85 conversion? I know it won't be as high, but am curious how well (or not well) this works with our stagger bores?

[Cliff Ruggles]

I suggest increasing fuel delivery about 30-35 percent, not opening up any passages up that percentage.  With carburetors we have several ways to increase fuel delivery across the load/speed range.  It can be done with smaller airbleeds and/or larger jetting/smaller metering rods.  There are many combinations of everything relating to increasing the A/F ratio so opening things up and larger jets, etc, is not always the course of action we take with these things......Cliff