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Old 09-25-2002, 08:19 PM
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Post carb vacuum

i have a question about my carb which is an Edelbrock performer 600. It's on my new 350 which has an Edelbrock Perf. Intake, GMPP HEI dist., Dynomax jet coated headers, and Edelbrock Perf. Cam. (.420 .442 lift). I have had some problems getting it to run and idle right. when i disconect the vacuum advance on the dist and plug the port it idles great at about 700rpm but once i hook up the line to the dist. the idle jumps up to about 1200-1400 rpm. I know there is supposed to be a ported vacuum port and a full time vacuum port on this carb but it seems that both ports are getting vacuum all the time as ive hooked it up to both sides. Also my idle screw is turned all the way down practically so i doubt this is the problem. Also my timing is set at about 34 deg. total. Any help would be appreciated thanks.

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Old 09-26-2002, 08:25 AM
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[quote]...when i disconect the vacuum advance on the dist and plug the port it idles great at about 700rpm but once i hook up the line to the dist. the idle jumps up to about 1200-1400 rpm. I know there is supposed to be a ported vacuum port and a full time vacuum port on this carb but it seems that both ports are getting vacuum all the time as ive hooked it up to both sides<hr></blockquote>

The distributor should be connected to the ported vacuum port (above throttle blade level). If not able to identify visually, find correct one with vacuum gauge. But it sounds like you have one of two problems (or both);
  • The vacuum advance cannister diaphram is leaking and causing a vacuum leak and/or;
  • The advance weights are sticking/binding (broken advance springs) and throwing base timing off when vacuum advance is applied.

If you have a dwell meter, check distibutor operation for erratic advance/retard. But it also could be as simple as having the advance mechanism connected to full manifold vacuum.
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