Rare 1967 Mr. Norm's 383 4 speed dart

65Val

I'll try to answer your question the best I can. I have a 67 GTS and have done a lot of research over the years. I believe that Chrysler made special manifolds for the BB A bodies because they had to. I'll explain.
The problem with the B body manifolds fitting into the BB A bodies isn't the passenger side manifold it is the drivers side manifold. That is where the issue is. If you look at a correctly set up BB A body you quickly notice that the manifold on the passengers side has some clearance. If you look at the drivers side the manifold is made to snake around the stearing column with minimal room to spare. That manifold is snug and pinched down to fit that is why there is a horsepower rating compromise. I know that the part numbers for the drivers side manifold changed within the three years the cars were made. They got better at the ability of the manifold to breathe and that is one of the reasons why the horsepower continually rose. The 69 M code cars also had a different drivers side manifold because the 440 is taller than a 383 thus the reason for the modification. If anyone thinks my info is inaccurate please chime in.
The one question that keeps bugging me is the breakdown of the 67 GTS's made. I don't neccesarily question the number of 457 but I'm not convinced that the 229 4 speeds and 228 automatics is accurate. I've been going to big shows like Carlisle for the last 15-20 years and I think that I have seen one other BB 67 GTS 4 speed. I have however seen 3 to 4X more automatics. So is it that most of the 4 speeds were parted out or destroyed, or was there truly less 4 speeds made?? Please chime in with your opinions.

Carl