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 - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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