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Old 03-13-2010, 12:45 AM
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help a few questions

First of all i have a 383, forged internals with around 500HP. I have a crappy 600cfm edelbrock. I cant afford the holley 750 double pumper i want. Would it be possible to increase the cfm in my carb to make it seems bigger? Im new to carbs.

Next, my car is running great since ive timed it, but it still crackles at higher rpms. What could be causing this?

Lastly, i have tried to time my car with a vacuum guage, but it shows a vacuum leak somewhere. Im hooking it to the large port in the middle of my carb. Where can i hook it into the manifold to make sure it isnt just coming from the carb? I just rebuilt the carb a couple days ago and the same results...

thanks! im new here and appreciate the help

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Old 03-13-2010, 01:43 AM
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No you can't increase the cfm.....unless you completely tore the carb down and had the venturi's honed to a specific size, expensive and not worth it.

If you have a vacuum leak you need to find and fix it before you do anything else, engine won't run properly with a vacuum leak.
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Old 03-13-2010, 05:53 AM
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What did the plugs look like after you took it out and spun it up? It may be leaning out, get one of the edelbrock tuning manuals[they come with all new carbs] read it until you understand where your problem is and adjust accordingly.You may need to change the metering rods, or jets. I'd check the timing at about 3000 to 3500 rpms to make sure all your advance is in, should be around 36 or 38 degrees.
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