I used to have the IH tuneup chart hanging on the wall in the shop. It gave all the different dist codes, total advance, rate of advance and part numbers of the spring sets. One day we got in a new tune up chart, parts dept tore down the old one, put up the new, but it did not have all that good information. Was more for later model tractors. I managed to tape the old one back together for the most part so it was still legible. Never saw a tune up booklet with all that good information. You can search and compare in the parts manuals and eventually come up with the right combinations but it takes a lot of looking. I have filled the max advance hole and filed it out on different occasions but , like said, trial and error. Correct total advance is always the most important for engine life. Curve makes it run smooth at lower speeds and loads. The cap on muffler should not be flapping back and forth when the engine is sitting their idleing.
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