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Well, I do know that the tolerances of an engine (piston/cylinder, bearings, etc) are designed to be correct at the designated operating temperature. Aluminum has a much higher coefficient of expansion than does iron. So, I think a lot of this dirty oil was caused by blow-by.
I was going crazy trying to get the belt tension correct with a Krikit, and then the belt would tighten up a lot when the engine was warm. Sure enough, the distance between the water pump pulley and the P/S pulley is measurably greater when hot, at least on an aluminum block.
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