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Originally Posted by Hatterasguy
Good theory. I don't know if the "lead foot" theory can be proved, some of the longer lasting 14 heads seem to be owned by people with lead feet, Turbodiesel and me for example, I don't know how plantman drives. I know Brian drives slower but his car has a newer head.
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Thanks for the reply. Yes, it is just a theory and there is an infinite number of different ways how people drive, and there isn't a practicle way to test my theory.
However, if for those who drive heavy on the accelerator never have a major cooling system failure that causes an overheating, or boilover, may never experience cracking. But what I'm suggesting is that underlaying in the area I've described is already fatigued from years of cycling from one extreme to the other, waiting for the time when the heat go's higher than ever before and at that point the stage is set for the weak area to crack, versus if you were to take a brand new #14 head and then overheat it and see if it will crack. If it does not, than it still remains possible for my theory. If it does crack, than my theory is likely full of holes! I'd bet a new 14 overheated wouldn't crack!
Anyway, something happens that causes the cracks and I have just expressed one possibility of many I'm sure.
Does anyone have their own theory?