Rasman,
It sure seems like the oil should have made it to the rockers after a minute or so. The path from block to center oiler, depending on year of engine can be a tough gig!
The path can be through a very small, plug prone tube and sometimes through a hole that requires a special head bolt.
This can be compounded by rocker tubes that are plugged with black sludge or rocker tubes that have the little drip holes smeared shut by metal transfer.
Hopefully the engine rebuilder did the right thing in this area. Keep us posted.
Stuart
