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

Right. We will agree to disagree and I'll continue to point out the fallacy of oil velocity and such. Because that is wrong.

I don't care who publishes it or who used it. Claiming you use it for anything other than supplying oil to the drivers side lifter bank is nonsense.

I can't help that you don't like me being here under another name. That's on you.

And its clear that what's good enough for you isn't good enough for me.

BTW and IIRC the guy who wrote the "How To Build A Chrysler Stroker" (I'd type out his name but the book is back in the library and I don't want to walk back in there and get it and I don't want to butcher his name) isn't claiming its a velocity issue any more.

FWIW, Chrysler put that oil feed port up there for the dry sump guys to get the in at the front.

If the pump and the galleries are sized correctly, adding another oil feed does absolutely nothing. It's not one feed is feeding two mains and the other is feeding two mains. All that is coming off the same feed. Unless you pull the oil off before it gets to the main feed.
Velocity is just another word for excessive flow or speed if you will.The crossover line does supply oil to the other side and if done right only slows the oil at #3&4 main, the majority of the speed is killed by the front setscrew. When you tube the passenger galley, it cuts the leaks to the lifters. But the set screw that gets put into the saddle cuts the flow to the drivers side lifters, but doing that also cuts the speed or excessive flow
In the galley allowing it to better make the turn to the mains. If you get more oil to the mains, you get more to the rods too.
Read the Sanborn notes I sent you. He never used full groove mains, and he front oils too, and runs a crossover,even with bushed lifter bores. Way different than most of what you have said. We have talked about
Passages sizes, pressure drops, entry and exit angle of fittings,front oiling, but you are hung up on terminology and keep talking
about the crossover as if that the entire mod.
It is not the entire mod and you keep taking things out of context. You refuse to explain your opposing oil columns even when a drawing is supplied and a member asks you to explain so that he might learn something.
Coming back on here under a new name and starting a rehash from what 3 years ago imho looks like you are praying on the unsuspecting, but hey, that just me.
I don’t like the new name only because I like to know who I talking to.
The crossover mod alone is not good enough
For me. Neither is tubing the block. I have learned and made improvement from the experience of others. The stroker small block
Mods go even further. I’ve implemented them too and I have had a custom cometic
Head gasket designed based on Sanborn cooling mods that a few members on here told me works well. I supplied pictures of the part number so that any member can buy it.