I grenaded my slant 6

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.
So then is it any different on the slant? in other words, I know on V8s you simply drill STRAIGHT through the mains. Is that the same procedure on the slant?