As the booze ads say "USE IN MODERATION". A SMALL amount of silicone on the inside of the gasket area won't hurt your bearings. It is not a chemical thing. What causes the damage is a LARGE amount that will plug an internal oil passage, or the oil pump screen, and starve the bearing(s) for oil. We had a SBC in the shop that the owner had worked on that had so much silcone under the valve covers, and he must have started it right up, that it had "collars" of silicone wrapped around most of the pushrods. Another example was a manual FWD transaxle from a small car that had a ball bearing fail. This tranny's bearings were lubed by the oil that was flung up by the gears landing in a trough. The oil was then channeled to one end of the shafts. The shafts were hollow, and for the bearings at the other end to get oil, oil had to flow through the hollow shafts. The hollow shafts were PLUGGED with a large amount of red silcone gasket maker, and the top, far-end bearing ran dry. The source of the silcone was the tranny was worked over when almost new, under warrantee, by the dealer. They used way too much silicone, and as chunks broke off over time, they were chewed up by the gears, and gradually deposited in the oil passages.
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