Requested oiling mod info

Rat Bastid said
The cam and rocker gear are always taking oil from the mains on these engines.

Now, if you are saying to do the crossover so you can block the feed to the drivers side gallery and still feed the lifters/rockers then yes, you can do that.

That’s not the same thing as claiming it slows the velocity of the oil down so it can make the turn into the main feeds and stuff like that. That’s not true.

And even if you do the crossover, you are still pulling oil of the main feed to the main bearings. You just shortened the routing.

Yes, that is My thinking, & appears to be what is accomplished. But it is required to bring oil to main#1 when the end of the right gallery is plugged in the front, & the angle is needed to generate oil feed towards the #1main feed in the reverse direction to give it priority in the left gallery.
It would seem to Me the main feeds at the head supply positions would really just need enlarged to handle the extra demand if the pump is maintaining pressure.