Carb vacuum port ID
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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. | ||
| − | + | A brief Crankcase Coalition article on vacuum advance can be found [http://www.crankshaftcoalition.com/wiki/Hot_rodding_the_HEI_distributor#Vacuum_advance '''here''']. A thread at Hotrodders.com on ported vs. manifold vacuum for the vacuum advance is [http://www.hotrodders.com/forum/port-full-time-vacuum-23169.html?highlight=vacuum+throttle+manifold '''here'''] | |
===Manifold vacuum=== | ===Manifold vacuum=== | ||
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