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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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