Im looking into upgrading my exhaust manifolds on my 72 Dart with a 318 before I have a decent dual exhaust put on it. Has anyone used Magnum manifolds on a 67+ A-body?
Be careful which magnum manifold you buy because very few of them have the large exhaust hole. They do fit the passenger's side with no problem. The Dakota magnum passenger may also fit on the driver's side but again very few of the large exhaust hole Dakotas were made.
Treblig
One is 1 7/8 and one is 2 1/8, but here's the thing. Even the smaller of the Magnum manifolds flows way better than any of the other small block manifolds not counting the Magnums. The outlet size is only one aspect. The shape of the manifold is important too.