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Re: header material - stainless steels
321 is better than 304, for exhaust manifolds (especially with sustained high heat applications). This made me wonder some stuff, so yes, I whipped out my Machinery's Handbook. I read alll about different types of stainless steels; 304 is a low carbon version of 302. 304N is the stongest 304 you can get. blah blah blah. Just make a header out of Inconel and be done hahaha.
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