hard or soft copper line for a valley oil gallery bypass line?

Duane said
I went back and looked through my Sanborn notes. Two things I noticed. Yes indeed he used pushrod oiling. But he also had bushed lifter bores. So why run a crossover. You say it’s to feed the lifters. Sanborn says the crossover line was put in to reverse feed number 1 main bearing. I can repost his notes if you’d like. He says without that crossover, you are feeding all the drivers side
Lifters off #1 main leaving that bearing prone to failure. It is right in his notes.
So what do you think happens to the oil in the passenger side if you block it from feeding 1 main bearing,1cam bearing,and 8 lifter bores. What effect do you think that has. Where else can that oil and pressure go.
To the 2,3,and 4 mains. And if the oil only has 3 leaks instead of 13, that oil speed in the galley is not moving very fast.
Sanborn also feeds the galley front and back as well.

Post his notes if you don’t mind. I haven’t read those in probably two decades. I’m sorry to say I can’t even remember when he passed.

And I just learned today a brilliant guy on another forum passed in December.

To that end, you are making my point. My memory was he was using pushrod oiling.

Once you block the oil to the drivers side lifters IF you are using pushrod oiling OR hydraulic lifters although I can’t reason why you would run a hydraulic lifter in a performance engine except for rules then you have to get oil there somehow.

To that end, the crossover tube works for that specific issue. It won’t save a main bearing.

I also get why he was back feeding the number one main.

I suggest there are better ways to get oil over there without the crossover, but the tube does that.

What it doesn’t do is fix the issue of oiling the bearings. It doesn’t slow down the oil.

That’s why I asked the OP why he’s was doing it. His answer had nothing to do with pushrod oiling. His answer was he was looking for more reliability concerning bearing oiling. The crossover doesn’t do that.