1971 Dodge Demon Hemi install

belmateo said

Will they work with any other crossmember? I know that the B/E body HEMI headers were used in the original SS/AA cars with some minor "adjustments"

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It's possible that the TTi's will work with other aftermarket crossmembers (Magnum Force etc).
You would have to ask them. If you are using a stock K-frame You could design and build your
own (Photo - HemiDenny) or you could adapt Hooker 426 SS/AA Hemi Dart competition headers.
They hang a little low though.