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The rear carb on my 72 has a vac port on the bottom. I assumed it was for the vac advance on the dizzy. Yet, I have seen them hooked up to the vac manifold also. When I took the engine out originally to overhaul etc etc, this port was plugged. After rebuilding the carbs I assumed that this was the place to draw the vacuum from. Is this the proper place for the vac advance hose? That's where I have it hooked up but get no reading from it at any RPM. How about a clue??? /ubbthreads/images/graemlins/crazyeyes.gif /ubbthreads/images/graemlins/nopity.gif PJ