Subject: Re: Exhaust Manifold Gasket

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Laurence, I think I have it. Or at least a major contributing factor. The manifold is held by 8 studs and 5/16 BSF nuts. It turns out that two studs have 1/4 BSW threads so it's quite obvious why the soft brass BSF nuts being forced onto these rogue studs failed.

And the engine was "professionally" rebuilt at great expense a few years ago. Ouch.

Thanks for all the help, very much appreciated.

John