I was wondering if anybody might be selling an exhaust manifold for under $100. I looked in the for sale section and found one. I wanted to ask in case he couldn't come through, it was an old posting.

Chaeck this thread. some, if not all, are still available.
http://www.slantsix.org/forum/viewtopic.php?t=37948

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

I would go with new. However if you need one I have some used uncracked ones for $25 plus shipping. That should be less than $50 shipped USPS.
Frank

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Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

i got a new one from 1Aauto.com just under a hundred, got it in a couple days and had new chimney and triangle manifold washers. fit well.

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84 D100 /6 long rod 225
86 D100 /6 my sons w/offy intake/weber carb
2016 buick regal turbo