If there's even a trickle off the rocker tip to the valve stem, that's all that's really needed. I'm pretty sure a lot more oil flows at highway speed than we're able to see at idle with the valve cover off during an adjustment procedure.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!