Thanks YR. making sense now. The effort is appreciated, and your long post will be read multiple times at this end.
I just checked a 360 main bearing..... the main feed hole is 10 degrees off from being straight up, towards the passenger side. You would have to move that hole just about 1/4" towards the driver's side to get it to be at 12 o'clock. so if the SBM crank is drilled at exactly the same place as the SBC that seems like it would equalize things pretty well. Would a slot in the main web 1/4' long weaken things a whole lot? Guess I need to look.
One thing I think you did YR that probably made another difference: bypassing the regular system for oiling the mains and going direct. I suspect you ended up with better oil pressure to the mains after that change which helped too. So how much a 10 degree timing change and a better oil feed did the trick, seems hard to separate out.
Thank you; I'll look at this for sure.
Now the next question: At what RPM does this become essential? And below what RPM is it a waste of time?
