Help me find the umph in my 360

Ugg somehow 2 retaining plate bolts came loose and fell. And snapped the timing chain and snapped the retaining plate it 2 spots. Also the oil spreader got shredded also. I torqued these bolts to spec. And I have no idea how two of them fell out.

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I have never seen an actual chain break, but a little loctite on the bolts may have prevented it.