Pushrod bulge
I went about it a bit different.
Used a length of 1/2" round SS bar inserted into the pushrod hole, ground out metal until I just touched the bar along most of the length (height of the runner), then 'repaired' the breakthrough with 1/2" brass tube held in place with epoxy and threadlocker. That way I knew that all runners would be very close to the same, and would probably be widened out as much as possible.
Just a thought.
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