Not to confuse things, but isn't stainless actually weaker then the normal hardened steel that is used on valves? I know that most things that are made of stainless compared to there counterparts in steel are weaker, chains, bearings etc. Stainless has great corrosion resistance which is why it is so desired in things like exaust. Stainless may be stronger in unhardened form than certain steels in unhardend form, but hardened steels are always stronger than stainless.
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