carburetor cfm question

[possum]

I'm replacing my carburetor. All the remanufactured ones have been junk. At Summit Racing.com they have one that says " Chevrolet/GMC: 1974-78 350-454
trucks and cars with a divorced style
choke, 750 cfm Performer Q-jet
carb

This brand new carb is 50 state legal
for 1974-78 350-454 Chevy/GMC
trucks and cars originally equipped
with Quadrajet carburetors. It's
engineered and calibrated to stock
specs and has all required vacuum
ports. The triple booster primary
venturii design makes for great
drivability and optimum fuel
economy."
Is that the factory or original amount of cfms for my truck? My engine is stock and I don't know how many cfms I'm supposed to be running without flooding out my engine. It's just a regular 350. The picture they had looks exactly like the one I just took off(minus the edelbrock name). If it isn't the right one can someone give me the part number or the type that should go on my truck?

 

[Thunder]

There were 2 types of Q- jets they used back in the 70s
One was the 750 cfm with the divorced choke that you described above.(Edelbrock#1901)
The other was a 795 cfm with a hot air choke(.Edelbeock#1902)
Either one will work fine on your truck.
IWhich one you need depends on what kind of choke you have.

 

[zakk]

very true. Also remember that if you decide to go to a traditional carb, don't get a 750 or 800 cfm "cuz it matches the q-jet cfm"

Q-Jets are a "variable" cfm type unit. So if you decide to go to a carb, a 650 would be plenty for down low torque.

 

[m j]

what troubles have you had with remans?
I dont think there is a difference in performance between a reman or that new one

 

[CaptCrunch]

I personally wouldn't shell out that much for a quad. Find a good rebuilder that offers a good warranty locally. Otherwise just do it yourself... it isn't super tough and even if the problems occur again down the road at least it was cheap. Those Edelbrocks IMO are a rip off

 

[reddog64]

There's a newholly out that's for offroad use... can do a 45 degree climb and a 30 degree roll w/o stalling... it's not expensivea t all...

check itout...

 

[NoSmog73]

I just bought the jet stage 2 Q-jet from summit and I really like it it was easy to install (duh) I have noticed a good powerband to and really good take off and when you step on it to pass someone else it kicks A## just my 2 cents..mike
If you want the info on it pm me

 

[NoSmog73]

Here is the part# JET-35002 you can see it at summit 359$$

 

[foolinjected]

I am on my 3d Edelbrock Q-jet in 1 year! This one is not good,but at least it runs. I would try the new Holley.