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stainless exhaust manifold caps?


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The steel 5/16 caps that the previous owner put on the exhaust manifold (xflow) are starting to rust quite badly so I'd like to replace them.


I've bought some replacement SS versions, but looking through the archives opinion seems to be divided about using SS - it seems it might harden through heat cycling and become brittle? Also is it more or less likely to seize?


Can anyone confirm (or deny) that this is the case and if so what should I be using instead? Should I use studs instead with brass nuts?

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