Quote:
Originally Posted by 36tbird
What if manifold vacuum is all you got, e.g. strombergs? I'm assuming that manifold vacuum is slightly less than ported. Can the reduced vacuum be mitigated with an adjustable vacuum advance set to the lowest setting?
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If you are talking about an 8BA carb, it not ported vacuum, it is a combination of venturi and manifold vacuum and is less than manifold vacuum. On a modern engine, ported vacuum means it is closed off at idle, other than that it's the same as manifold vacuum.