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Old 07-06-2006, 10:59 PM
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Help, another Edelbrock Carb Problem

Hello everyone,

I'm having a problem with my 1407 750cfm carb. Its a new factory rebuild. The problem is when you gas it hard from a stop it wants to die, you back out of it and its ok, if you start again slowly it seems better but it does seem to run rough till about 2000 rpm. I'm guessing this is a lean condition? I have tried changing the primary springs in both directions with no effect. Maybe I need to go further with the springs? It also seems that the throttle position adjustment is to far out, if you try and turn the idle up just a little more its running of the primaries.

383 Chevy Stroker
Vortec Heads 9.3 compression
xe274h Cam
Air Gap RPM intake
1.6 full roller rockers
DUI Ignition

I'm not really a carb guy and any help would be appreciated.
Thanks, Jordon

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Old 07-07-2006, 01:51 AM
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750 Carb

If you went to a 650 or 600cfm you would be surprised at your performance.750 is a lot of carburator on a street smallblock. Good Luck
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Old 07-07-2006, 05:28 AM
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carb

2 things.

First you need to have the correct timing on the engine... Where is your initial and total timing at now???

Second, all the edelbrock carbs i have ever installed needed the pump rod moved into the hole that is closest to the carb body....

keith
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Old 07-07-2006, 06:12 AM
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Rebuilt

Let me get my soapbox out for a minute !!

There is a reason this carb was returned for a rebuild. There was something wrong with it to begin with. A slosh thru the solvent tank, a new needle and seat and a set of gaskets, maybe(?) might not have fixed the inherent problem that it originally had. I have had "factory" rebuilds in the past, and without exception, all have needed a little to a lot of TLC. This includes Holleys and Edelbrocks.

Now, with the soapbox put away, the first thing to do is insure the float is at the right height, the squirter is per spec, the rear linkage is correctly opening the secondaries and the fuel pump link is set correctly. Once you know what the installed metering rods, springs and jets are, correct to the "as supplied" condition, THEN you can start playing with changes. It can take an entire afternoon to get it right, using Edelbrock's IB and mechanical choke mod kit.

I agree with blkblt that a 750 over carbs a street engine. See this Edelbrock site: http://www.edelbrock.com/automotive_..._app_chart.pdf

These carbs will perform great - unfortunately bigger doesn't always make 'em better
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