My “theory” for tubing the main galley but not the other has two reasons. This engine will either get SFT or solid rollers, so maximum flow to the lifters is not necessary- just want a bit to lube the bores. As I mentioned I don’t trust splash oiling alone on a street engine that will see a lot of idling / low rpms. I blocked the oil from leaving the #1 main to the driver side galley so to introduce a little oil to those lifter bores, I ran the crossover.
Second reason for not tubing the driver side galley is that I would just have to drill holes in it to lubricate those lifters. I’m hoping the small diameter line acts as a restricter and won’t flood the driver side oil and cause the usual gushing leaks around each lifter.
So basically I tried to restrict the amount of oil leaking rather than completely plug it off. If I find that the crossover is passing too much oil I will try a smaller line, or possibly a set screws with hole in it, or just remove it and plug the hole. Saves me from the hassle of tubing the other galley. Like I said, it made me nervous doing the first one. I had nightmares of the rearmost lifter bore splitting like a melon as I drove the peener down through.
Clear as mud, right?