Just pulled the carb off of the V8 in my donor car. There is a Quadrajet inscription on the side of it. Is there only one type of Q-jet or are there other models? Is this one from Holley? Manifold is spreadbore and bottom of carb is 4 butterfly valves.
topside...is missing the valve for primaries?(is the mumbo jumbo correct?) Anyways just wanted to see if I can get any help ID-ing this thing. Don't even know what the motor is(305 or 350). Car has no vin plate(rusted off) and door tags are gone. It has a two needle speedo thats all I can tell. Any help?[list]

and how do you guys get that list of cars and mods at the bottom of your posts?

 

Well, if you know what car it came off of already and the size of the V8 then you'll know what it was designed for. If it is a carb before '81 it will probably be Non-computer controlled. The ID tag is posted vertically on one side (most likely the throttle linkage side) and it should be intact since it is part of the body of the carb, clean it off if you can't see the number, but it is there trust me. It will start with either 70xxxxx (before '80) or 170xxxxx (after '80) and it isn't the number on the choke. If you can find the ID tag I can probably identify what motor it came off.

I think the quadrajets came in 3 basic flow rates, my guess would be one for 305 Low output, one for 305 HO - 350, and one for 400+ CID. I can't confirm this and it may be a little off.

AND if you want to post info about your car at the bottom like you'll see in my post, go to the user CP (button above) and select "edit profile" then you'll see in your info a text box with the word "signiture" next to it, type the info you want to share in that box and submit changes. Then whenever you post just click on the "show signiture" box below the text box.

Hope this info makes sens.

- CPC

 

OK. The Number on the side of the carb is 17083204 and under that 2073 FRB.


Thanks

 

Here goes...

Carb is from:

Car: 1983 Pontiac Firebird S/E
Engine: 305 V8 LG4
Tranny: Automatic
Carb: Rochester 49 state 4bbl quadrajet

 

What can you tell me about this carb. I grew up in the fuel injected era and do not know too much about the history of the carbs.

 

In 1981 GM started putting CC Quadrajets in their cars. So, it is a Computer controlled quadrajet which means you need the apropriate harnesses and computer to use it (best found in donor cars). It should be adequate for any 305 as it is, there are mods you could make to it (in tech articles on this site) to get up to 800 CFM... as it is it probably flows around 600 CFM.

As far as History goes, most Quadrajets are pretty much the same, I have heard that they came in three ratings from the factory... something like 600, 700 and 800 CFM But not many people can confirm this and it is widely debated.

So if you're looking for a carb without the computer, any 70's Chevrolet Quadrajet (denoted by the 7th digit in the carb ID (0-2 are chevy) will do; and I believe Pontiacs had the same carbs (# 6-7), but they used Pontiac motors up to '81 in Pontiacs.

The disadvantage of computer controlled carbs is that they decide how to distribute fuel... so you usually get better mileage, but you sacrifice a little bit of power (~10-15 Hp) that you could probably tune to get back w/o the comp.

A good place to find these carbs is on ebay... people put them up and give an ID number and they don't know where they got 'em.
I picked up a '79 vette carb for $20 'cause the guy thought it was out of a Caddy.

I can't give much more info since I am still in the process of learning... I myself was only born in '80... But carbs are by far my favorite mode of induction.

One last thing... the best way to find out where a carb came from is to type in the ID number into a search engine... it works 95% of the time for me so far.

If anybody else wants to help my figures or further my breif history, please feel free.

- CPC

Edit: I just realized that my post is nearly identical to the one above... I knew it sounded familliar...