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I am one of the heretics that uses the metal impeller water pump. When my metal impeller pump's bearing went South, I replaced it right away. The light on my temperature gauge started blinking, indicating coolant was low. I made it home and had it flat bedded to my indie Porsche specialist. The impeller did not come in contact with the block. The thing that scares me about the composite impeller is that heat cycles can cause the impeller blades to break off and travel into the cooling passages in the heads where they get stuck and create hot spots. Either one needs to be replaced at regular intervals.
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