Many overhead-valve tractor engines as well as car/truck engines did not come with valve-seals new. In the 60s, Chevy small-block V8s were known to be smokers when the valve guides got worn. They had no seals when they left the factory. Had to add seals to many. Just because and engine didnt have them new doesn"t mean it doesn"t need them now. If it tends to smoke when holding back in a low gear coming down a hill, or at first start, etc, - valve-seals can probably help a lot. If it smokes when being worked, it"s more apt to be a piston/ring/cylinder problem.
I"ll add that many companies that made heavy-duty engines designed the heads and valve guides to leak a little oil and smoke, when new. The reasoning was that this added lube would extend the life of the valve stems and guides. It was also expected that once worn, seals could be added later. You can usually add seals to a four cylinder engine in an hour.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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