Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Ported Vacuum or Manifold Vacuum?
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Old 09-03-2008, 10:19 PM
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At WOT it doesn't matter which way it's hooked up. The ported side just keeps the vacuum advance from moving the spark until you move the throttle. This will help part throttle drive-ability and economy and provide a more stable idle. When you are at WOT engine vacuum is at zero.

The vacuum adv. canister should only see vacuum at off idle cruise speeds.

This is my take...
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