Ported vs Manifold vacuum
Elder User
Joined: Apr 2004
Posts: 970
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Ported vacuum is vacuum originating above the throttle plate, since the tap for it is at that point no vacuum is obtained at idle. Manifold vacuum is gotten anywhere below the throttle plate. As far as how it relates to the 300 engine I'd have to dust off the books,
but I do believe they used ported on the advance side of the distributor, and manifold
on the retard side of the engines equipped with the dual chamber advance unit.
but I do believe they used ported on the advance side of the distributor, and manifold
on the retard side of the engines equipped with the dual chamber advance unit.
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Steve Bennett
1948 - 1956 F1, F100 & Larger F-Series Trucks
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Jun 10, 2010 06:29 AM
