Mark W. Winning

I have a 355 with a Edelborck 600. It was the manual choke model, but the electric choke has been added. After some changes to the springs, the carb runs great. BUT, when you really stick your foot in it the car blows fuel smoke out the pipes. You can see the cloud hanging behind you. Its not oil smoke either (new motor and you can smell it). I cannot see a 600 dumping to much fuel for a 350, so there must be something wrong somewhere. I have a 750 DP on it and it never smoked. Any ideas??

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1992 Pontiac Firebird 350/Six Speed
1987 Toyota Pickup 383/500+ HP

82camaro

Keep tuning, your running too rich. The CFM is how much AIR the carb will flow. It has nothing to do with how much fuel it will supply.

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350 with stealth intake, holley carb, 470 lift cam. 700r4 with .5 boost valve, vette servo, tci lock-up kit, B&M megashifter. Richmond 3.73 gears, powertrax locker, timkin bearings, synthetic lube. Custom 3 inch single into 2 2.5 pipes. 1 1/2 drop springs, 1 5/16 solid front sway bar, 1 inch rear bar, custom subframe connectors, custom LCA relocation brackets. Kobel ground FX, current red metallic paint. Lots of other stuff...
82camaro

FastBroker

Sounds like you need jet and/or rod changes. Make sure your needle/seat assemblies are not stuck open and that the float levels are ok and FP not too high, If those are fine, you'll need the Edelbrock Tuning kit for that carb. Enough rods and jets and springs and directions in there to get you right.

Mark A Shields

I'm having the same problem, the smell of gas and the cloud of smoke, plus black powder on the tailpipes, I would think these carbs would come adjusted properly without running rich.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B&M Megashifter
Soon to be installed
Exhaust Cut-Out and different gears, either 3:73 or 3:42
"There is nothing more addicting than speed"

Apeiron

Be reasonable. Adjusted properly for what? How would they know exactly how to tune a carb to run on your car? They're shipping a carb that the customer is going to put on anything from a mild cammed small block to a fairly nasty big block. Out of the box it will get the car running. Optimizing its performance is your problem. If you don't like that idea, then get a factory FI car.

super83Z

true CFM is airflow but the lower CFM carbs also have smaller jets than the bigger ones.

Did you just bolt the carb on? Have you tried dialing in the A/F mixture? Is the timing right?


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I WOULD RATHER PUSH A CAMARO THAN DRIVE AN IMPORT

1983Z28 350w/ edelbrock performer RPM power package , dynomax shorty headers, 700R-4 with shift kit, 750cfm carb, edelbrock 3" exhaust system, ASCD SS hood, 16" IROC rims.

future mods:
completely done over suspension, black paint with flames, Hurst shifter, dakota digital gauge package, procharger supercharger.

SSC

The carb you describe is built for performance, number 1404/1405 I think. The jets and rods compared to a 1406 larger. You are not getting enough air in higher rpms to burn all the fuel so I would drop down the secondary jets untile the problem goes away.
SSC

FastBroker

As I suggested, by the Edelbrock Tuning kit for your carb P/N. Go to there website and there are some sample AF problem instructions there. You will also need to do some ignition curve fine tuning, I am sure...

There is no way a single carb could be setup perfectly for every situation/engine. If a carb could do that by itself OOB, it would outsell all other carbs combined.

Guest

Generally they are rich right out of the box. Dont ask me why.

I'd suggest a carter strip kit or the edelcrock kit, and tune it. More than likely you will have to drop the rear jet sizes by 4 and the fronts by 2, depending on what they stuck in it. The rods with the largest drop from the upper to lower diameter generally give the best driveability, and put the pump shot one step above the lowest setting. Thats a good starting point, then go from there.

Mark W. Winning

Thanks guys. I figured it was rich, but I was stunned by how much. Yes, this is the "performance" 600. I just called and ordered my new springs and struts, so I added a kit to it.

Besides the problem, the carb ran fine out of the box. I guess they set them a tad rich to be on the safe side. I would rather be rich than lean!

Thanks again.

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1992 Pontiac Firebird 350/Six Speed
1987 Toyota Pickup 383/500+ HP