Why do you think the Clevite's are better?
The real key is maintaining an effective oil film so that the surfaces never actually touch. Tin is nice and soft so if some contact occurs on start up or high pressure, scuff is less prone to occur.
With the proper oil pan and oil level (prevent aeration), the OEM bearings should be sufficient for all but the most extreme application.
Loose sand that is smaller than the downstream passages WILL transport with the oil to the bearings, so the next set can expect far less sand.
