Any Pontiac guys on here? Need insight.

Well, today was the day. I got a known good lifter from a guy I know and tested my theory. First I popped the pushrod seat out of it and, low and behold it has the pattern stamp into the restricer disk. Put it back together, put it back in the car and, it oils the valve train. No other lifter even spurted out any oil. Moved it to another hole and...it oiled that rocker arm. New lifters have been ordered.