My take on the oiling system crossover tube for the small block

another caveat is that a v8 the eccentricity of the oil film moves around depending on which bank has the force (v8 middle bearings have 4 angled cylinders and two offset crank throws- one on each side)
think of the diagram as one for an inline engine
The older 6 cylinder diagram recommended oil feed at around 4 o'clock
those trying that with a v8 had more failures
we found 90 degrees easy to do and worked as the design of the bearings had more clearance at the parting i.e. the installed bearings are not round
as said above oil pressure does not make hydrodynamic wedge but adequate volume at the right place does
grooved lower bearings reduce the load area and hurt the dynamic wedge
it does not show in the article but an un goved bearing loses support on the two outside edges on a curve
one with a slot loses support at four edges
now trade that off with rod oiling