I don't know why they made it adjustable, but there is a very specific procedure published in Field Service Bulletin, #234, November 1955, for the Model '80', but no otherws. It basically explains that you will balance the cam gear position so as to provide identical lift between #1 and #2 exhaust valves, but it is several paragraphs long. You might want to purchase the FSB CD-ROM from Duane Larson's estate, as there nearly 2,000 pages of interesting information. And since it is copyrighted, I can't print it for you here.
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Today's Featured Article - Farmall 460: That's My Girl - by LeAnn R. Ralph. How many sounds can you think of that are as familiar to you as your own breathing? What about the hum of your refrigerator? Or the thump of your clothes dryer? Maybe the engine of your car? You hear those sounds every day, and you don't think much about them, do you. I can think of a few common, ordinary sounds in my daily life, too.
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