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A main bearing has a different load on it than a bushing.A bushing is usually used to hold a component in position or as a guide or as a sort of shim for oversize holes where there is virtually no tolerance and there´s usually not much load concentrated on a particular portion unlike a main bearing where the crank tends to move around under stress.There may be a bronze-alloy that would work,but I have never seen them used as a main bearing,at least not in a post world war 2 engine.
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