Holes down. If you put the holes up the rocker arms would get no oil until the shafts filled completely up with oil & started forcing it out the top. With the tiny oil feed line they would run dry for quite a time each time you started up.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.