79vetteL82

I want to get a new Q-Jet for my Vette and I'm not sure on which one to get, Edelbrock or Jet stage 2? Edelbrock lists 750CFM and 795CFM which would be the right one for stock to mildly modified? I also want to get a performer intake. Does anyone know the CFM of the stock Rochester? Any help would be great!

Alwyn678

The CFM of the stock one is 750 I would get the smaller one for sure

dman535

Why not just rebuild the q jet you have, is there a problem with it ? Does your car have an aluminum intake on it already ?

79vetteL82

No I dont have an aluminum intake yet but I do want the performer from edelbrock. Would that be a good mod over the stock intake? My car bogs when it gets higher in RPM's :sleep: It needs more ***** :auto:

dman535

Is your car stock ? original exhaust ? cat convertor ? mufflers ? is the engine original ? I my memory serves factory 79 L-82 had an aluminum intake on it. A factory L-82 is a decent performer, I wonder if you have something in there more along the lines of an L-48 type motor.

79vetteL82

I have chambered exhaust from mid-america, no cats, no mufflers. I do have an L-82 because it is a factory aluminum intake but it's factory painted.

Marv

I'd just rebuild it but if you are dead set on replacement, the Jet Perfomance Stage 2 should be the best performer out of the box. They will take your stock configuration and factor in any mods you have like true duals, cam gear ratio, etc. They will then set the carb up with the proper jetting and adjustments for your setup. Your original carb was a 17059211 or 17059228 Q-jet which is capable of 795 cfm. My understanding is that 350 cubic inches isn't enough displacement to utilize that much volume. Make sure your HEI is giving you all the timing advance and that the shaft/weights aren't worn out. Stock is 16 degrees mechanical advance pluse 12 degrees static on L-82 -all in by 2000rpm. Another 6 degrees makes them run much better. Good luck.

Marv-

Turbo-Jet

I seriously doubt a 350ci can exceed the flow of 750 CFM (unless you are spinning 10,000 revs;)). If it were not for the Q-jet's unique air-valve design, a 750 would actually be too large for a stock SBC. 750’s are what GM used on all but a few 427's and 454's.

First step is to get your current carb tuned properly by checking the A/F ratio, and adjusting the secondary opening rates and float height.


[Modified by Turbo-Jet, 10:18 PM 2/16/2003]