Exhaust manifold gasket - metal side in or out? - Vintage Mustang Forums

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post #1 of 4 (permalink) Old 05-20-2010, 10:16 AM Thread Starter
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Exhaust manifold gasket - metal side in or out?

I am reinstalling the exhaust manifold and the gaskets have a metal side.

Which way do I place it? Metal to the block or the the manifold?


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post #2 of 4 (permalink) Old 05-20-2010, 10:58 AM
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They didn't originally have exhaust manifold gaskets at all, but if you wish to install them anyway- shiny side out.

Neil Hoppe

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post #3 of 4 (permalink) Old 05-20-2010, 11:01 AM Thread Starter
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Thanks Neil. I did not know they did not have gaskets originally.

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post #4 of 4 (permalink) Old 05-20-2010, 01:59 PM
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Yes, originally the mating surfaces were perfectly flat, unpitted, and rust free. But some 45 years later...
Folks determined to run as original will get the manifolds flycut a smidge. Me, I use gaskets and like them. If I were to go gasketless I'd have to cheat and use a very light smear of "Ultra Copper" RTV to assure a complete seal. I've spotted the telltale soot marks on a couple of concours type restorations where going gasketless was indeed 100% correct but unfortunately not 100% leakfree.
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