My take on the oiling system crossover tube for the small block

Read these 2 pages.
You are given 2 options to upgrade oiling system.
One is restrict flow and open passages so it goes where you want it by tubing galleries.......

The other is to close off #1 main gallery feed to passenger side and install crossover tube to feed #1 bearing and drivers side oil gallery.

It States both are feasable options for up to 10k rpm engines.

Yes, the pickup tube and pan should be modified to support the increased oil requirements of high rpm demands.

This mod was CO-INVENTED by Larry Schreib and Larry Atherton so it says on the first paragraph of next page.
All blocks were sent to Bob mullins and Co. for the modifications to be performed.

Dropbox - Photo Nov 01, 11 54 45 AM.jpg

Dropbox - Photo Nov 01, 11 54 50 AM.jpg