Progression Ignition's programable distibutor initial review.

jbc426 said

Truly. The Progressive Ignition app allows from 0 degrees on up for adding vacuum advance plus control of whichever vacuum it is set at and reacts to. In my case, it was adding less than 10 degrees. The root of my problem was even that is too much at lower engine speeds. I think I may have gotten away from such damage if I didn't have overdrive, but what do I know.

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Were you looking at the plugs?? If so, did they show any signs of distress?

Getting cruise timing correct is not that easy, even if you are doing it digitally.

In my experience as power goes up you need less timing at low loads than you would will less power.

I guess saying it another way a dead stock engine from the era we are talking about will tolerate much more cruise timing than that same engine that has been modified.

Rather than adding in 12, 15 or a bit more VA timing with a stocker the modified engine may only want 6-8 degrees of VA timing.

And that 6-8 degrees will make a big difference in performance on the modified engine.