Nutty, this is some of the dumb stuff I try to figure out. My thoughts at first were as yours, for more surface area. But they put a lock washer under them so the contact surface area is the same wether large or small nut. They made that move when they went to the alumium intake but they also went to a alumium water manifold which is just as long, has half the number of 3/8 fasteners and has to support a exhaust system on the turbo engines and they changed nothing there when they went away from the cast iron units. Sorry, now I'm ranting. Rod.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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