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The one's i seen were drilled into the head, just below the rail for the gasket. Usually like a -8 AN bull nose tapped in there, guess its a 3/8's NPT, and then the line down to the oil pan. I cant...

Just for asking's sake, could you plumb a line from the right side head down to the oil pan? Some mod guys do this to help with drain back. Seems like it would help if you don't have a scavenge...