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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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