I was wondering, I have a 1984 Camaro Z28 w/ a 305 H.O. (L69) I am considering putting a new carburetor on. What size and type would you recomened.

Also does anyone know how many c.f.m. the stock Rochester is, and what all exactly does the computer controll on it, are there ways to bypass that, and get better performance?

 

There's nothing fundamentally wrong with the CC q-jet on your car. The Tech Articles on this board have info on getting the most out of your q-jet, and although this typically isn't a problem on L69 carbs, when properly set up they'll flow 750 CFM. That's enough to feed a highly efficient 305 to 8500 RPMs.

The computer controls the mixture of the primaries only. The computer gets info from the oxygen sensor and keeps the mixture proper - until the higher throttle positions at which time the computer gives a pre-set mixture (by then the secondaries are overwhelming the primaries). The secondaries operate exactly the same as the non-CC q-jets. The carb also provides information on throttle position to the computer, but the computer doesn't control throttle position.

The other basic engine control function the computer controls is ignition timing above base.

Typically, the only thing the CC carb needs is secondary tuning, and that's covered in the Tech Article. The CC ignition often needs improvement in the form of aftermarket control module and coil. Otherwise, the L69 set-up is good to go for a 305.

And better than anything aftermarket, unless you're talking about a race-only set-up (and then you wouldn't be running a 305, would you...).

 

I'm with 5-7... the Qjet isn't holding you back at all... If you want more power, look at replacing the exhaust first.

 

I've never had any real problems with my CCQJet on my 355. The carb has performed flawlessly, and gets decent gas mileage to boot. I have had a few other problems with the CC system, but never the carb. I've been told by several people that I know well that I'd never see the performace and driveability I was looking for with the CCQJet. So far I've proved them wrong. The car is good for mid 13s and gets around 22-24 MPG highway. Most who ride in the car can't tell its carbed... That's how well mannered the system is!