Rocker arm boss fixed. No drilling necessary. The threads stripped out completely and cleanly so I was able to just tap the hole and thread in the helicoil. Only problem being that the tap wasn't a bottoming tap, it was tapered, so the new threads tapered in near the bottom of the hold. Had to make a bottoming tap by cutting off the tap above the taper point, then run it in again to thread all the way into the hole, then it worked like a champ.
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