Does anyone know if the aftermarket exhaust manifolds for the 3.7 L engine (which seem plentiful) will work on my 2.8 L engine?(63 valiant)

Yes. The only differences between exhaust manifolds are year to year changes in the flapper, choke stove, and an O2 sensor. They'll bolt to any slant six.

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Matt Cramer
1966 Dodge Dart turbo / EFI project

all 170, 198 and 225 Factory style manifolds will interchange.

The quality of the Dorman / aftermarket manifold is somewhat suspect / unproven if I remember correctly.

The O2 Bung could be a nice addition for the purposes of tuning a Carb or an injection system!

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http://www.youtube.com/hyperpack

Thank you!