As I recall, one of my engines, may have been the '71 chevy tub I spoke of earlier had a thermostatically controlled flapper in the snout of the sheet metal air intake where the filter is mounted on top of the carb. Or maybe it was vacuum controlled......I vaguely remember having to remove a vacuum type hose when it was removed....I think it connected to a metal tube adapter in the top of the intake manifold using manifold vacuum as it's "motor".
There was a paper and alum tube roughly 1 � to 2" that came up from a piece of tin on the exhaust manifold and connected to a vertical tube protruding out of the bottom of the cover behind the temp sensing butterfly. On top was some sort of round cap hootus about 2 � to 3" in dia.. Below certain temps the carb would suck in manifold heated air and as the engine warmed up the butterfly would open the normal cool flowing port and close off the manifold air..
The other one we called The manifold heat riser. There was a (this is 40 year old memory trying to surface here too) butterfly in one of the exhaust manifolds on the V8 that was supposed to be closed during cold weather. Job was to close off (spring loaded allowing fast acceleration of engine to force it open if necessary) that manifold and force the hot exhaust air back and through a passage in the intake manifold below the carb, to heat both, routing it over to the other side and out the tail pipe. That's the thing that usually stuck and it stuck shut, closing off that side and impeding performance.
So add those to the one that operated the choke butterfly contraption with it's stepped, movable stop and all.
So I guess over the years there were 3 manifold associated tricks Detroit tried to heat engines when cold to which I was exposed. Geez what a mess.
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