Was wondering... Would a quadrajet 4 barrel for a 455 olds fit on my 330 engine? I have the 7027036 f7....... pre 68..... What are the best options for the the 330..carb ...want to keep my " Climatic cumbustion control " air breather....Is their a Holley or Elderbrock carb that fits this air breather?
Just looking for options..nd a " New " carb.... Last question....
Does anyone know what the cfm is on this original carb...? 650...700..?

Thanks!

 

The maximum CFM on quadrajets are either 750 or 800. The 800 CFM versions were only in the 70's though from what I understand.
I say maximum because of the way that the secondaries operate. The top door is opened "on demand" due to vacuum through the secondary ports when the throttle blades are opened. If the engine is only demanding 520 CFM, that's all that it will flow.
So using a carb from a 455 on a 330 isn't a bad thing EXCEPT that the calibration will be off as far as the mixture and a few other things go.
I actually had a 1970 350 carb on my 455 in my 70 442 and it ran great. It was on the car when I got it so I have no clue as to what, if anything, was done to the carb to make it run right.
Food for thought.

 

Any Quadrajet will fit, but like Randy mentioned above, the calibrations are different in almost every Quadrajet. So, putting a 455 unit on your 330 could work, if the 455 unit was calibrated for the other engine. I suggest starting with your 7027036. That is a 67 330 Quadrajet and set it up. You don't gain more power or any advantage by choosing a 455 unit.
Randy also correct in the 750/800 cfm. All are capable of 750 and some more than 800. The larger castings were scattered through the years and makes. Olds had some from 75 and newer. Cfm was restricted by how far the secondary system would open. Which, of course, can be altered.

 

If you already have a Quadrajet then rebuild it. You can either buy a rebuild kit from the auto parts store and put new gaskets in it, or you can send it to a rebuilder that can match the primary jets / rods and secondary rods / hanger to the build of your engine.

If you send it to a rebuilder I suggest investing money to have the threads on the fuel inlet heli-coiled and have new throttle shaft bushings installed.

 

So then I can put any quadrajet on this 330 ( this is not electric ) and just adjust it until it runs smooth?...

 

So I can place any quadrajet 4 barrel and adjust it to my engine fuel flow? T

 

Calibrate to the air flow and fuel requirements....yes.

 

I was looking at a Jet 35002 Rochester quadrajet ...Summit website says it will not fit on Buick , Olds , etc...Because it's for a Chevy..( something about the spread bore ) Amazon sells it as well but some of the reviews say that by a simple linkage adjustment it will fit many manufacturerers...Compression ratio is lower as well..Would it fit my 330 ?
Thanks

 

Chevy uses a filter housing that is turned 90° where the Olds filter housing is straight. Other than that and the linkage the body of the carb is basically the same and use the same base gasket.

Chevy:


Olds:

 

So what compression ratio do they claim this carburetor has???

 

8.5 - 9.5:1

 

I was being a bit of a smartass - carburetors do not have compression ratios, engines do. The carb won't care what the engine's compression ratio is. The displacement of the engine will be the factor in how much air flows through the carb ( the volume of air per unit time).

 

Oh Lol! I went back to the site and it was listing specifications or for intended upgrades. I thought thats what you meant. http://www.jegs.com/i/JET-Performanc...35002/10002/-1

 

Your best bet is going to be having a quality rebuild of your 7027036.

Have it performance calibrated for your setup. This will out perform any generic calibration you can find online, and there is the benefit of keeping the original carb, with the right linkages and the right choke bracket etc etc.

Calibration services are included with a rebuild service at Everyday Performance LLC.

You wont gain anything by going to a 455 carb on that 330

 

x2

If your Q-jet is professionally rebuilt you will know what components were put into it. While buying a Q-jet rebuilt for Jegs or Summit would work, it may be a mystery as to what components are in it.

 

Everyday Perfomance will be in the same price range as that Jet carb and be calibrated for your car. My car ran much better after sending my Qjet to Everday Performance.