Pertronix SVDA - Binding Vacuum Advance

Took the distributor apart and found that the rotational movement of the top plate (connected with the vacuum actuator) was limited by a rubber grommet passing the wires from the electonic module out of the distributor.  Pretty sloppy assembly not to notice or care about this. 

I cleaned the plates, lubed the interfacing elements, and trimmed the rubber grommet to restored full vacuum advance rotational movement of the top plate. 

I also discovered that it takes a full 8in Hg (and more like 10in Hg) to get full vacuum assist actuation from the Pertronic Flamethower SVDA. 

I took the distributor off the car with the clamp still intact, and found that I had to retime after reinstall as the engine was about 5+ degrees retarded now that complete vacuum advance rotation was restored (now that the vacuum actuator was able to cycle to its complete resting position).

Still have the problem with the Kads just not putting out enough ported vacuum to move the advance at least during revs from idle.  But can't wait to get the issue solved to take advantage of the now full degree of vacuum advance movemenet from my distributor.

By the way, this rubber grommet interaction with the advance plate in the distributor also provided a random variable with tring to dial in a constistant idle, as the idle speed depended on both on how the carb idle speed screws were set as well, as where the advance plate came to rest on the grommet. 

Nice to have at least removed one idle random variable.

 On my twin carb engine  with the solex brosols I have vacuum coming from both carbs to a Tee back to the dizy  I would think that is a standard set up??

Do you have any idea what your ported vacuum signal to the distributer is, e.g., while revving from idle to about 3,500rpm. 

The reason I ask is I was running that same set up and was only able to about 3in. Hg, which is not a big enough signal to move my SVDA (starts to move at about 3 but really needs 10 for full movement).

Thanks, Grant