Quote:
Originally Posted by evilways
Should I be using the intake port on the rear of the intake for the vacuum advance? It is currently plugged.
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I've used both ported and engine vacuum for vacuum advance. Seems to work ok on either.
Ported vacuum is a vacuum tube on the carburetor that's above the butterflies where engine vacuum is below the butterflies. You should have both on your carb. Just make sure you plug the ones you're not using.
Don't forget to plug all vacuum tubes on the carb when checking your timing, though.
If you want to learn more about pros and cons about ported vs non ported this guy has a good writeup. Gets a little complicated but its a good one to learn about how vacuum advance works.
http://www.hotrodders.com/forum/dist...1-a-59033.html