Possibly related to missing a head oil control orriface? I was looking over the Helms manual today for all the pieces and parts involved in engine lubrication, and I don't remember ever seeing this little guy when we put the engine back together. A shop had the head off too, and I would think they'd catch something like that... but then again.
I know the intake and exhuast rocker shaft orrifaces are in place, simply because we went to extraordinarily tight security with them.