[Cliff R]

Limit the travel of the vacuum can rod. Some of those adjustable units are for the spring pressure, some for the distance the rod travels. In any case, limit the movement of the rod to apprx 1/8" or .125". There are lots of ways to close down the window and limit the travel of the rod. Some vacuum advance cans even come with a "cam" that goes under the screw that holds the unit down, which allows for adjustments.

We use a MIG welder here to add some material to the "window", then a round chainsaw file to open it up to about 1/8" of travel. This is a good starting point, and will limit the advance form the vacuum unit to about 10 degrees. You can open up the window for more if needed?......Cliff

[67drake]

Thanks Cliff.
Do you think I should try to go to 18 initial ? Seems like nobody else runs this high,that I see. I would wait till I went to the track next time though to do this. Seems like the seat of the pants meter don't work too well!
I figure in the mean time I'll throw my piston stop in there and check to see if the timing mark on the stock dampener is accurate.

[GTOGreg]

Originally Posted by 67drake

Thanks Cliff.
Do you think I should try to go to 18 initial ? Seems like nobody else runs this high,that I see. I would wait till I went to the track next time though to do this. Seems like the seat of the pants meter don't work too well!
I figure in the mean time I'll throw my piston stop in there and check to see if the timing mark on the stock dampener is accurate.

Do you have a new balancer? I didn't replace mine at build time and it started to slip, throwing timing way off. All seems well after having replaced it (though my plugs are now toast)