Cams with right and left hand cam nut threads were used in a C281. More than one IH part number could be found on some cams, even though its the same use. If you can find a number ending with DA or DB its a cam like used in a 450. DB has left hand threads for the gear retaining nut, the rest have right hand threads. If its a aftermarket or a regrind the only way to tell is checking the lobes, unless they stamped there numbers on the cam. Valve timming was changed to gain a little more power over cams with the part # ending with the letter D. Don't know if its just me, but seems like the early cam uses less fuel.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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