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

What I can’t understand is why you are hung up on this.
What you said was "Having opposing feeds in the same gallery can stop flow at some point in the pipe." When I read that statement it struck me. It's not how I understood how hydraulics work. Maybe my understanding is wrong and I can learn something from this. That's why I asked you why you believe this to be true and if you could point me to some evidence to support your claim. Some of the lessons I've learned best are the ones I had wrong.
I couldn’t care less what you think about anything except why you think a crossover works.
You have me mixed up with someone else.