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

Do I gave three examples that actually work and you picked the most expensive one to ***** about.

I said tube one side and use a set screw to block the oil to the drivers side. It works and if you are careful you can do that with hand tools.

Or you can tube both sides. Why not? It actually forces the oil to the mains and that’s the end goal.

For the umpteenth time Sandborn was pushrod oiling so he had to get oil back to the drivers side so he used the crossover for that. I can think of better ways to do it. But again, the crossover tube doesn’t correct or fix what the OP is doing.

The crossover is redundant to get oil back to the drivers side. If you want to slow oil velocity drop the presser but it’s lunacy to think that the oil needs to be slowed down.
I am not bitching about anything. Rapid Robert based on lengthy discussions with others has decided to do the crossover tube.
It’s his choice. There is more than one way to skin a cat. I am just saying that bushing the bores is expensive and difficult to source that machining. The tube and set screw works. I can vouch for that as I’ve done that. Another member on here McAllister is also very knowledgeable as well. Pick your poison. But there is no reason for every member on here to only listen to you.
That’s your *****.