jellycalais
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An engine blocks is normally made of cast iron, the continuous combustion of the fuel/air mixture would create heat of temperatures around 100 degrees and even hotter in the combustion chamber. The continous cooling and reheating of the cast iron would create a substance which is called Martensite, which is a hard and brittle compound. Eventually due to the brittleness of the cast iron, the block will fail. Just my opinion from studying engineering at school