is the collector area have a larger volumne that a one barrel exhaust manifold or is the only difference is the flange plate is bigger for a larger pipe to be bolted on? thanks GRT

no difference....

That's right: No difference between "1bbl" and "2bbl" exhaust manifolds.

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Too many people who were born on third base actually believe they've hit a triple.

I have noticed that the outlet on the 1v manifolds point straight down, while a SuperSix is slanted about 5* towards the frame.

No such a difference. There may be minor angle differences among different years of manifold, but there is no such a thing as "the difference between a 1bbl and a 2bbl exhaust manifold". For any given year: One part number, one manifold, no difference.

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Too many people who were born on third base actually believe they've hit a triple.

Except for the fact that the two SuperSix manifolds that I have, have the aforementioned differances, as compared to the 1v manifolds that I also have. All of them are from late '70 slants.

How 'bout grabbing some casting numbers off the manifolds you have, Kesteb, and posting the info here? That way, I can go get in the books and we can figure out what you're looking at. All the manifold comparison eyeballing I've ever done says there's nothing such as a "Super-6 exhaust manifold", and the factory parts and service information backs me up pretty solidly by listing no difference between the exhaust manifolds that came on 1bbl slants, and the ones that came on 2bbl slants, in the North American market, year by year.

Given that all slant-6 exhaust manifolds look almost identical and are 100% interchangeable with zero mods from '73 on, while there are at least eight different part numbers for exhaust manifolds from '73 to '86, with subtle differences, that's probably what you're seeing, is a year-to-year difference. Could also be factory vs. aftermarket!

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Too many people who were born on third base actually believe they've hit a triple.

Well it appears that you are right. Please refer to http://www.kesteb.us/album/manifolds

The pictures manifold01 - manifold04 were pulled from an engine that I pulled from a 1980 Mirada. This was a 1v setup.

The pictures manifold05 - manifold08 where from a SuperSix setup that I bought from an estate sale for $25. The casting numbers are the same for both manifolds.

The last picture (manifold09) is the current manifold on my car. It was from a 1978 Aspen with a SusperSix.

I have pulled several SuperSix setups over the years, I have never ran across one with a 2 1/4" down pipe. I believe this to be another myth.

It is my distinct impression that the earlier manifolds had the outlet parallet to the ground, with the bolt holes parallel to the block. As you can tell, the manifolds that I have are not that way.

For real? That's...strange! For many years (when Super Sixes were common in the yards) the easiest way to upgrade to a 2¼" headpipe was to go hit the yard with a hacksaw, cut off the headpipe about 9" below the flange on a Super Six, unbolt the stub and take it to the exhaust shop for them to work from. I put such a flange in my '65, and in my '62, and in several other buildups. I never spent much time under the hoods of the '80-'82 vehicles, so one possible explanation is that in those dark days when Chrysler was trying to save every last possible fraction of a cent on every vehicle they barely managed to produce, they went back to smaller pipe. But at least the '76-'79 Super Six cars, plus the '76 Feather Duster and Dart Lite, definitely left the factory wih 2¼" headpipes.
H'mm. Y'know, I never paid too much attention to the angle of the outlet flange. You may be right. I do know I've swapped early/late exhaust manifolds and had the original headpipe bolt right up without angle-related problems. That means either I've gotten lucky, or there's enough give in the system to take up a 5° swing (seems kinda doubtful on some applications), or the angle difference is an optical illusion (entirely possible given the external changes to the manifold castings).

Manifold Destiny, here we come!

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一期一会
Too many people who were born on third base actually believe they've hit a triple.