Four bolt mains

works great
you just grove the block main bore from the oil hole over to the parting line and drill a hole in the bearing
to be better it would appear to be down the cap some but nothings perfect
you are trying to get the oil in where it's needed for hydrodynamic wedge
there are pictures on where the sweet spot is for inline engines
not so much for v8's and IMHO the sweet spot moves around depending on which bank is firing
so I take the inline data and apply it to both banks
you cut down on the big oil hemorage at the bearing feed in the center of the block
crank is being pushed down (mostly) but the clerance actually moves around