Edelbrock or QuadraJet?

i like q-jets but i was forced to run them on my dirt track car. once you learn how to tune them there dam near un beatable.
but im a cheap ass so i say work with what ya got.

 

Thanks Bill that was really informative.

 

I re-read my post; hope I didn't come off like some kinda 'know-it-all' asshole; just that I went thru all that w/ a comp 750 on a 383 mopile.

Never did get the fucker to work. In hindsight, I think I know what was wrong with it, but don't have it here to fiddle with.

But though it hurt at the time, it forced me to learn a bit about that particular series of carb.

Best of luck. Keep bumping this up to the top. Someone in MO has to be able to give you a hand. I'd be happy to if you could make it over here to WA...

And be sure and cap off the thread with whatever the solution ends up being. 'Cause I always want to see how the story ends.

-bill

 

I had the EXACT same problems you're having on a Buick 350 with a 750 AFB. The engine has a fairly aggressive cam, headers, 10:1 CR...

Leaned out the AFB. Fattened up the AFB, without much change. I could get it to run good at idle, but it'd starve the engine above 3000 rpm. Got it to run good above 3000rpm, and it would do what you're describing below 3000rpm.

Later found out it had been in a carb fire before I got the car and just cleaned up. Everything was warped, causing massive vacuum leaks.

I ended up with a 750 QJet built by a reputable QJet builder (and F.A.S.T. racer). Nice guy too. Haven't looked back since.

 

I have lots of Eddie experience. I had 1405, 1406's, and 1407's in single and dual quads.

It sounds like your large intake (its a very large runner and plenum volume and almost a single plane and its a shit intake on anything less than 350 ci and 3000 rpm) is not getting a large enough pump shot and is starving for fuel when your tromp it. You can change the pump shot by changing the hole in the linkage or order the carter pump clusters and change them

The afb eddies do not like a large plenum volume due to the small accellerator pump. You can tune it to work (I had a 1407 on a M1 single plane for years) but on a large intake like that you need a double pumper to cover the hole in the fuel curve. I would even add the REO kit with the 50cc accellerator pump to the holley secondaries to cover the hole.

Change the intake to something like a stock 327 intake in afb pattern or something like a performer. You will be much happier.

 

I've got a stock intake with the oil fill. If you're down Jefferson City way I'd let you have it for some cold ones.

Tim

 

definately the Edlebrock it has seemed to last forever on anything you put them on, and run real sweet.

 

Here is what I am running now, I did forget to mention 305 heads. Oh and an alternator now.

 

What kinda heads yu running with that offy. stock 265 heads had small ports and most after market manifolds have larger ports. You need heads and intake with small ports and runners to keep the velocity up on the 265. It would probably run better with power pack heads and a stock intake with a wcfb or a rochester 4 jet. If none is available then I'd go with a early stock non egr intake and q-jet

 

305 heads... same cc chamber as the 56' style PowerPak heads I had on before.

 

Get you a dual plane intake and bring it on down. We will dial in it and make it run.