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For stock exhaust manifolds on a 400, do the thin aluminum Felpro exhaust gaskets in a kit actually work? Or, is it better to get a thicker style?
 

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Stock cast iron manifolds are very rigid and don't flex like headers can. As long as both surfaces are clean and relatively free from pitting, you should be fine. I like using anti-seize compound on the bolts so they're not such a pain to remove "next time".

Bear
 
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