Difference in materials. Cast iron heads on cast blocks held with steel bolts. When you are torquing bolts to a spec, you are actually torquing them to a certain stretch point. After a few thermal cycles, some WILL relax, especially where some are different lengths. Also, the underside of the head never quite fits flat down on the surface, so there there is some galling involved, but probably not equally. Newer engines are alum. on cast, alum. on alum. etc. I think they are better designed to eliminate headbolt stretch. (In most cases).
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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