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Base timing + advance timing, no more than 40 degrees total. In midseason 2008, my points came loose, I needed a quick tune up, I had a spare dizzy, so I swapped it. It didn't run right, Lazy,,, so I borrowed a digital timing light and checked it. Base was 20. Upon accelleration, it spiked to 60 degrees, then fall back to around 35 when the rpm peaked. I found the dizzy that the points loosened up in,,, took it apart,
along with the one I was running at the time,,,,, , Well, the first dizzy was a 16 degree advance unit, The second was a 40 degree. Went back to the 16 degree,,,, stock advance springs, Night n day difference!! It now sees a 36 peak, But, I brought it back to 30 by readjusting the base timing. I swapped the advance springs for a lighter set, I watched the timing light under accelleration, It peaked timing at 30, right before peak rpm. So my timing was done adjusting, before my peak rpm arrived. On a 40 degree dizzy, the timing advance total travel is quite a bit, but, it floats,, or hunts,,, its not consistant, you get a different reading everytime! Another symptom was, The base timing adjustemnt, never seemed like it changed the timing any,,,, so I knew the advance was floating,,, Hunting so to call it. Hope this helps. I wouldnt lock the advance on a Farmall. With so many selections of distributors, It's easy to sort once you see what its doing with a digital timing light. I would not wanna fire up my engine with it locked in at over 30 degrees timing,, in 30 degree temps or less,,, Might be considered rough on the old H,,,,, LOL! Chad
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