There's a lot more oil flow from the spit holes at driving speed. It will barely ooze out at idle. You won't be able to see the lube groove orientation in the rocker arms without disassembling the rocker and shaft and looking inside the rocker pivot holes. If the groove is offset from the spit hole, you have the late model rockers.
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!