Replace rocker shafts for sure

PRH said

Of course....... if it had pushrod oiling, you could plug the original oiling to the top.
You know........ like the factory did with the magnums.

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And how would the shaft oiling be at that point? My guess is dry. Also had a thought, with a solid roller with lash wouldn't the oil just slop out of the pushrod and pressure would be lost?