Other than the comp ratio of heads could be different, the ignition systems have several different spark advances. Magneto was basically 35 degrees , batt ign could be 40 ,30, 25, 22, or 16 so that would be one place I would check out. Some minor changes were made in carburetors, main jet size, air bleed size or blocked air bleed on some power packs. Valve length will tell you which head you have but of course you can't tell that without disassambly. You could check the head numbers under valve cover. A worn out govenor will make a gutless wonder also along with the proper adjustment of govenor internal linkage.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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