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Originally Posted by roflwaffle
How can it send heated exhaust back through the intake manifold so that it wouldn't be drawn back into the engine? Was there a separate series of passageways just to heat the carb w/o actually sending any gas back through the engine?
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Yes.
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In either event the system would have to be some form of EGR since trapping gases in the manifold would result in some that are trapped in the cylinder and sending it back into the carb/intake to be drawn into the cylinder would do the same. EGR can be from the exhaust to the cylinder or just trapping more exhaust gases than normal in cylinder.
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Nope. This system was only on "V" engines. With the flapper shut, hot exhaust from that bank went up and over through the intake manifold via special passage to the exhaust manifold on the other side and it all continued on out from there. I doubt the back pressure rise on the flapper side was enough to cause an "EGR" effect. Even if it was, it would have only done one bank! As an example, I put sidepipes on my old small block Chevy but kept the flapper. From cold, almost no exhaust went out the right side sidepipe. It all went out the left. When the flapper opened it went out both. It works on single exhaust too for as you know "V" engines all have dual exhaust until the point they are joined.
Actually go look at one of these things, then it will become clear.