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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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