The best I remember, the two holes in the crank at the main journal are drilled so the two holes suppling the rods are connected. That way when either hole (rod holes) pass the main hole oil is supplied to both rods at the same time. You do not drill any new holes in the crank. You drill through the existing holes at an angle so that it will exit into the other rod hole. You are just creating a new passage way between the rod holes. Hope this helps.
