That's called an "oil connector" and yes, it is supposed to vent the excess oil back to the crankcase. As long as oil is seeping out of the holes at the top of all the rocker arms, ignore the leak- - - -it's supposed to be there.
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!