Oiling modifications

I did finally find it,Thanks !!Can anyone explain this for me ??

"The best way to check these passages is to drill through them with a 5/16 (.312) long shank drill, with the cam side main bolt / stud installed."

Is this the same idea as boring/honing with a torque plate to mimic the torque stress on the area ?

no this is to open the hole for more oil flow...

be carefull as not to flood the top end tho...