Burned pushrod

The Idnys are fed with an external oil line, and he's got the restrictors in it. The #8 exh is the last rocker on the shaft. The cup end is fed by the shaft oil coming thru the rocker. If the passages are clear, I'd say it's a simple case of not enough volume getting to the shafts. If there was a starvation isssue, I'd think there'd be more going wrong. Hemi, you're sure that rocker is fine? Have you tried swapping that one with another to see if the issue follows it?