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Hello
as far as I know their only advantage is smaller weight vs the stainless ones. In my opininion they have place only on VERY high revving, big valved racing motors, like let's say drag cars. They make the whole valve train system alot more easy to be handled by the springs, so even more aggresive cams may be used. BUT they are significantly proner to breakage because there aren;t as strong as the stainless ones, so in my opinion they are not very applicable on a street car (even high performance). We could say that for the serious racer guys its a necesity that they cannot avoid and for this reason they are inspected in every given chance and eventually changed so as to be sure that the engine will not be destroyed. Oh, they are expensive too!!
Hope to be of a liitle help
JIMP
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