How does oil get to rockers with solid cam setup

look at the pic. you drill a hole down thru both head oiling holes and into the oil gallery on each side a little smaller then the tap for a small set screw. lock tight it in. next you can remove the #4 cm bearing and turn it upside down and reinstall it. then drill an 1/4" hole to feed the cam bearing,this way the #4main and #7&6 rods will not get starved of oil.