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With the size of a 3 cylinder 1.0L engine, cast iron would be a lot easier and cheaper with little weight penalty . With aluminum block manufacture cost are a lot more as to get strong block you need to encapsulate the main bearings bridge ,unlike cast iron which is fine with bearing saddles .
Only issue with cast iron block is dissimilar metal one with head being aluminum and rate of expansion being different , possibly head gasket issues down the road .
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