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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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