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Draco-REX oil starvation might not have been the culprit. there's an, as of right now, uncommon factory defect of the "pin" that holds the rocker arm failing and backing out of the rocker arm. This happened to element tuning and they now offer a fix for it with their headwork.
Hopefully that's all your problem is, should be an easy fix for you if that's all it is. Keep us posted as you rip into it some more.