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Aluminum is a lighter material good for racing applications but Cast iron is heavy but has good heat absorption Aluminum doe not dissipate Heat very well like cast iron. There is to my knowledge no such thing as a stainless steel engine block to expensive at least in a production stand point.

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Q: What engine is better a aluminum block or a stanless steal block?
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Aluminum is used for cylinder heads and engine blocks to make the entire engine lighter. A lighter engine is desired for a number of reasons, including better gas mileage, better handling, better braking response and better chassis balance. Since the aluminum used in standard engines and cylinder heads does not provide a good surface for high-friction areas, such as valve guides and piston cylinders, where aluminum-to-aluminum surfaces would wear out too quickly, other metals such as steel is used for the aluminum component to slide on. For example, an aluminum piston rides inside a steel liner which is inserted into the aluminum engine block. Since aluminum and steel respond very differently to the heat and cold in an engine, very careful design engineering is required when using these two metals together.


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