ported or manifold vacuum hei sorted by
relevance

Admin06.09.2021

Ported vs manifold vacuum advance

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5307
Admin05.09.2021

Timing & vacuum advance, SBC HEI.

Slight throttle vacuum goes away.
4308
Admin04.08.2021

Ported vs manifold vacuum advance

A proper tuned carb or EFI with the correct timing will not have the issues he is talking about.
5305
Admin18.09.2021

Timing & vacuum advance, SBC HEI.

It is a very good writeup.
5207
Admin06.08.2021

Technical

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78010
Admin31.08.2021

Timing & vacuum advance, SBC HEI.

For the stock built engine the non ported vacuum advance is the most efficient way to go.
3503
Admin09.08.2021

Hot Rods

Excessive vacuum advance at steady part throttle cruise will rattle a bit, know what I mean? What happens with MANIFOLD vacuum is that it DECREASES with high load and speed.
1705
Admin05.08.2021

Ported vs. Manifold Vacuum

Sorry I missed this part of your question the first go around.
8206
Admin08.09.2021

Technical

If it was to full manifold I would only have initial and mechanical at take off then all 3 at idle and cruise, right? Why would a hotrodder want modern emissions gear? I have a timing monitor on my 2018 5.
3108
Admin10.09.2021

Ported vacuum vs. full manifold vacuum

"The Air Pollution Control Act of 1955was the first federal legislation involving air pollution.
3306
Admin05.07.2021

Timing & vacuum advance, SBC HEI.

Learn at idle was at 20-23 now after changes it's up to 28.
6502