Your manual is quoting distributor rpm and not engine. Therefore the 20 degree advance at 800 rpm would be equivalent to 40 degree advance at 1600 rpm. That 40 degree advance was for the original cast iron piston with standard bore. If you have installed a thin wall sleeve and aluminum pistons the degrees drop to 30 degrees at full advance at engine. If you have a high alt piston or fire crater the advance continues to drop to close to 22 degrees. Over advance causes detonation and lack of power with damage to pistons. If you adjust a 40 degree advance distributor to have 30 degrees at full throttle you of course will be late at low speed and not run freely. You can take the distributor apart and fill in the hole in plate that controls maximum advance and then play with the springs by curling the ends to get close to what ever advance gives you the best performance. It takes trial and error. You can get different distributor shafts and correct springs for that shaft also if you want to go that route. I have no idea what pistons you have so can't say what advance you actually need.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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