Not trying to be argumentative here but I looked down that bolt hole in my block with a light and could not see any oiling provision in it. I don't see how any oil can get up the stud. Maybe it would drain down but to where? What am I missing?
if there is an oil hole in the bolt threads connected to that passageway from the cam tunnel I can't see it. The smaller hole above it in the picture is obviously what mates up to the head and the oil is fed there from the timed #2 cam bearing hole but as far as I can tell that particular bolt hole with the modified stud in it seems isolated from any pressure-fed oil.