Just following up on this.
Pulled the intake off JJ last night in order to get ready for an upcoming swap and checked the rocker stands when they came off. The stands did not show any signs of movement at all. We were pulling this engine to 7400-7500 rpm each time and with 680 lbs of open spring pressure, I think any fretting would have shown up.
I'm going to implement this modification on future builds where options are few, such as on Tunnel Port heads.
