RE: Engine Bearings???
Unless you are prepared to sacrifice an engine on the alter of curiosity It would be safer to try the stainless option. When ceramics fail they do it suddenly and frequently cause catastrophic engine damage.
Steel bearings, including stainless, will give plenty of warning if you check regularly for roughness of the crankshaft.
The biggest killer of glow engine bearings is poor storage, allowing rust to do the damage.