Vacuum advance question

[rearview]

Ok Guys, I'm sitting here at work going over what still needs to be done to my Dodge to make Cheaterama on July14 and for the life of me can't remember something...

Does the vacuum advance on the stock Stromberg BXVD-3 work off manifold vacuum or venturi vacuum?

With the dual Holleys I'm on manifold vacuum, and if it's originally set up for venturi vacuum, then that is why I get a pop every once in a while. I'd be better off without in that case.

Thanks,

bob

[Plymouthy Adams]

The engine timing needs to advance in relationship to speed and therefore the vacuum should be venturi ported..as the throttle valve opens the increase in air over the small port increases the amount of vacuum. To port ones advance off the manifold works in reverse to your needs...at steady idle you have steady pull hopefully in the 17-21 range, and on decel your vacuum is at its max..23-25 inches...thus you are max on your advance...if you accelerate, you lose your vacuum and you advance is lost (retarted)..be sure that you are venturi ported and that you base line timing is set with no vacuum.

[rearview]

Thanks Tim for confirming what I thought. I'll be better off without for the time being.

Bob