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 - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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