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

Rapid Robert said
I googled Sanborn (a deceased guru here on FABO) & there is some heated pro & con conversations regarding this. I will dig in further & definitely give alot of thought/weight to your info. thank you. RR

Hey Robert. I am a firm believer that the crossover mod works to slow oil velocity, when properly done. Having said that, I have never done that method because the angles that you are asking about have to be done right or it doesn’t work. Imho it is not a diy
Job. I found the tubing of the main gallery
Easier for a diy to perform.
The crossover mod has evolved to where sisters think it is just a matter of putting in two fitting and connecting any old tube.
That is why

92b said
The way I understand hydraulics is if you have pressure even if it is supplied to each end of the pipe as long as there is an area of lesser pressure in the system there will be flow to that area of lesser pressure.

Thankyou. Although I do agree with one part of his explanation. Feeding both ends cut the flow in the galley. Which is exactly what is desired. The pressurized oil has nowhere to go but to the low pressure area at the bearings, which is exactly what we want. The problem with the stock system, is there are too many other places for the oil to go.