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

Duane said

Sanborn went further than that.He ran a separate line from the oil filter area to the front of the main oil galley feed on “X” blocks. He did indeed vouch for the many oiling problems the small block has when raced. Hydraulics does not totally apply. It is not a sealed system. There are leaks everywhere. This has been well discussed on here.

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Yes it has. And the error of what the crossover does is still being spread like the clap in a high school locker room. I also didn't agree with the line up to the front unless it is the only feed. Having opposing feeds in the same gallery can stop flow at some point in the pipe.

Hydraulics always apply. Even in a constant flow system like the oiling or mechanical fuel injection. Classic hydraulics is high pressure, low pressure and return. With these systems you only have pressure and return. There is only one pressure (although the pressure varies at different points in the system) and return, and the return is where the leaks are.

You can reduce the leaks but you always have to have them. My end point is adding the crossover to slow down the oil isn't going to slow down the oil flow. Oil flow will always be the end leak. Big leak, big flow.

The crossover modification has it's place, but using it to slow oil flow isn't one of them. That's why I asked Robert why he was doing it. If it's only to slow the oil down he's wasting time and money.