There has always been a huge debate over which is better, hooking the distributor to ported vacuum, or to manifold vacuum. Some say ported vacuum must be use, while others say you should use manifold vacuum (such as the author of the article below). We recommend using which-ever works best for your application. If the motor runs better on ported, great, but if it runs better on manifold vacuum, that's fine too. There is no right or wrong answer. Try both and see which one your...​
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