The block is about .810" thick at that point, and the chip extends down about .160", so there's .650 of decent block for the shaft to sit in. I can't see any further cracking in the hole.
But the inside edge, where the break is, is missing about .400" of surface. Those shims and the camshaft would have to run on a surface missing that chunk.
What would indicate that it was an old break?
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