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Old 01-22-2006, 09:08 PM
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Timing Port Dilemma

Hey guys (and gals if any are reading), have a question........I have a 350 Chevy Vorteck engine in my street rod; mild cam, headers, usual stuff. I just installed a new MSD digital e-curve distributor and an Edelbrock AVS Performer carburetor. I can figure out which vacuum connection port on the carb is the timed port and which one is the manifold vacuum port. The installation instructions that came with the carb said to connect the distributor vacuum advance line to the timed vacuum port on an emissions controlled engine or the manifold vacuum on a non-emissions controlled one. The MSD instructions said to hook the vacuum advance line up to a ported vacuum source, which is obviously the timed port on the Edelbrock carb. The question I have is: since I don't have an emissions controlled engine, would I have better performance with the timed port or the manifold vacuum port? Or should I just throw the instructions away and see which one works better?

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Old 01-22-2006, 09:44 PM
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Doc here,

My Vote for a Performance non Emission Engine Is Manifold source, Many will disagree with me..But it has served me well on Corvettes for years..

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