What is this thing under the carburetor on my 1981 Ford 300ci straight six engine? What is it and what does it do?

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Comment by Kevin F Smith on March 7, 2020 at 11:02pm
This question is for my 1981 Ford F-100, which is our toad vehicle.  But might also apply to early Winnies with the Ford 300 straight six engine.  


What the heck is this thing under the carburetor?  It is a finned casting, sitting between the carb and the intake manifold, with a huge vacuum canister on the end that looks like a giant version of the vacuum advance on the distributor.  On mine, the vacuum hose isn't hooked up to anything.  What is it, what is it called, and what does it do?  Any ideas?


Thanks!


Kev



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