I know what Tweety averages mpg-wise, so I'll try that for two tanks to see what happens...

 

Cool man. I'd love to get some additional confirmation on this one. I received a PM yesterday from someone who tried it and liked it.

I think you'll either feel a huge difference in driveability, meaning that you were drawing manifold vacuum before. Or there will be no difference at all, because there may be more than one nipple that works. I know that the 1st nipple works, but there may be one or more others that get vacuum from the same source.

Also, you should verify your timing after making the change. If the timing was set while the vac advance was hooked up to manifold vacuum, then the timing will change when you make this correction. If the vac advance was disabled prior to setting the timing, then you should be okay. Just keep that in mind...