Carb vacuum port ID
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====Vacuum advance==== | ====Vacuum advance==== | ||
One use is for the distributor vacuum advance. There is always debate on which type of vacuum for the vacuum advance is "best". The simple truth of the matter is there are reasons for either to be used, depending on the situation. While ported vacuum for the vacuum advance is often thought to be for "emissions" applications, in certain cases there are sound reasons for a performance engine to use ported vacuum. | One use is for the distributor vacuum advance. There is always debate on which type of vacuum for the vacuum advance is "best". The simple truth of the matter is there are reasons for either to be used, depending on the situation. While ported vacuum for the vacuum advance is often thought to be for "emissions" applications, in certain cases there are sound reasons for a performance engine to use ported vacuum. | ||
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| + | More on vacuum advance can be found [http://www.crankshaftcoalition.com/wiki/Hot_rodding_the_HEI_distributor#Vacuum_advance '''here''']. | ||
===Manifold vacuum=== | ===Manifold vacuum=== | ||
A manifold vacuum source will be there all the time- at idle and when the throttle blades are opened. | A manifold vacuum source will be there all the time- at idle and when the throttle blades are opened. | ||
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====PCV vacuum ports==== | ====PCV vacuum ports==== | ||
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