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I have the arizona z car four barrel intake manifold set up. And was wondering if any of you know where to attatch the ported vacuum, on the manifold, or on the caburator(holley 390).


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TroyLTD
 

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On the carb but experiment, it might idle better with it on the manifold.
 

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I think I read that the Holley 390 has a port for the advance. I would use that.

It will idle the same no matter where it's tied in since it's an "advance" for higher rpm but idle rpm should be the stock timing no matter what.

-Mark
 
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