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
I talked to him a couple of times before he passed. Really a nice, smart guy. I don't recall reading his stuff or talking to him where he said the crossover tube slowed the oil down. He may have, but I don't remember it.
If you are going to do the crossover to not pull oil off the number 1 main to feed the drivers side lifters I say do it. If you are doing it because its going to slow the oil down to make the corner then it doesn't help.