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

Yup. And evidently you haven’t learned anything.

And yes I read the text. Again proof that it works. Never seen any.

So tell me you had a crossover and was shifting at 8500 and then you took it off and **** the bearings.

You’d argue with a stop sign.

I’m trying to keep the OP from wasting time and money with a useless modification.
At this point in time I would not recommend it either. I have never done that mod myself
for reasons already explained. I have done the tubing of the galley because it’s easier to do imho. But I find the oil mods in the stroker small block book even better.
But reading what the crossover is supposed to accomplish, makes sense to me and is very similar to what Sanborn had success with as well. You have acknowledged that you are posting under a new name for reasons only you know. We have had this discussion previously, so I will bow out of this conversation as it has turned to insults.
I wish you all the best yellow rose.