I am putting full exhaust on my car this winter and I'll basically being overhauling the car. I was wondering about this q-jet sitting on my engine, I'm running a basically stock 305 and plan on doing some light racing next summer while I work to get some cash to put in something "better" like hopefully a built 383 with a full drag race setup etc. So, I was thinking about a new carb. Would it on my current setup get me any decent performance gain or would it simply cause my engine to run rich? I'd want to get something that I would then put on my new engine without killing my current one, I would have no real problem waiting til I got my new engine before I change carbs but I was wondering about whether it would help/hurt if I were to buy the carb or what other factors or whatever I'd have to think about when choosing one.

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84 stock Z-28 V8 305 H.O.
1/8 10.328@66.06
1/4 16.246@80.82 phear!

 

If you plan on keeping your car emissions legal, then you have to keep the computer controlled QJet that your car came with. Ditching the computer controlled QJet would require also ditching the computer controlled distributor and pulling the check engine bulb, becuase the ECM will throw a fit once they are no longer under the ECM's control.

Fortunately, there is a lot you can do to improve the performance of the CCQJet. There is an article on this website about it that should get you started.

 

I suggest putting on an older non CC Q-jet and a non CC distributor... get a q-jet off of a late 70's chevy or pontiac that was originally for a 350 or 400 and it should suit your needs. I don't know if it will still be emissions legal, but the big stock aircleaner will hide everything from site... most places will not even care. Going to an aftermarket carb may make it too sucpicious when they see that your charcoal canister isn't hooked up etc. If you're gonna put a 383 in there, just get the carb for that engine then. You can get a used Q-Jet on ebay for about 25 bucks and rebuilds are pretty cheap.

 

If you have echecks you might want to consider a universal manifold that can adapt to all carbs. So when its sticker time you can pop your distributor and cc carb back on. Two carbs are perfect for a 383. 1. holley 650dp mec secondary.
2. holley 750 vac seconadry.
SSC

 

I know for upstate NY it's just a visual inspection... just gotta make it look stock, or convincingly legal... I am in the process of recovering my emmisions equipment, cause the dip**** I bought it from had friends in the business to give him a sticker... my car came with zero emissions equipment, so I'm switching back to Q-jet someday...