I grenaded my slant 6

Don't full grove main bearings do the same thing?
Unless they make a galley all the way through the crank. no they do not.
It's all mains feeding all rods, constant , instead of 2 feeding 4 and the end each Independent.

Where ever the leak is greatest...the combined volume fed will keep it oiled to kingdom come. No longer will one main be in charge of 2 rod journals.