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Cavitation erosion. That face is adjacent to the tips of the impeller blades and the gap between them determines water pump efficiency - the greater the gap, the lower the pumping efficiency. It looks like about 2/3 of the face is in good nick so for stocker or mild performance engine it will be OK (I've seen a LOT worse in some L-series Nissan engines without noticable problems). OTOH if you are planning to build a high performance race engine I'd suggest finding another block.

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