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Discussion Starter #1
Hey guys. I'm going through the motions trying to get my carb optimally done up as best I can, and have a few questions.

First off, here's what I've got as far as the motor goes;

- 355 sbc
- Comp cams 276-tl56
- Edelbrock Performer RPM intake manifold
- 3947041 cast iron heads (I've heard they're roughly the same as camel humps)
- iron stock manifolds (shame shame shame, I know)

The carb I've got is an eddy 1405, nothing done to it yet other than idle settings.

When I've pulled the plugs they look as if it's running lean, I can tell you it probably isn't the idle settings, as rich as it smells.

When tuning the carb for idle, I just used a vacuum gauge to go for maximum vacuum, that's what I hear will get you as close as possible to getting the idle circuit correct without a wideband. The car seems to like the idle mixture screws 3 & 1/2 turn out, does that sound right?

My big ball of questions is to how close would you all think a stock 1405 is to being right for my head, cam, and intake set up, will I most likely need to go richer or leaner on the jetting and rods?

Is a 600 cfm carb going to be too little or too much carb for my engine?
 

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That sounds about right on the idle mixture. In my opinion a 600 cfm is too little. But it will do just fine if you're not racing.
 

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The 600 is a good match for a 355. Most guys over carb.

You're n the right track with the tuning
 

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A 350 is borderline if to use a 600 or larger. I am not sure on that cam, but it sounds too big for those heads and exhaust manifolds.

I have that same carb on my 327. I tried to set the primary screws by vacuum and it was like yours - 3 1/2 turns out and smelled really rich. Now, I don't really want to recommend this, but I got mad and turned each screw in by one full turn. It runs great like this. I have also changed the jetting and springs to get it right.
 

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Also, IMHO the Quadrajet is THE best carburetor for a 350 and smaller CID's. I have one for my car, but I just haven't taken the time to rebuild it, swap and tune it.
The most common Quadrajet flows 750cfm, but the primaries are really small so you get great throttle response and fuel mileage ! The edelbrock carburetors are like this, but not as much as a Q-jet. The Street Demon carbs also have small primaries/ large secondaries.
 
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