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This is the "F" looking vaccum that screws into the water neck. I suppose one oopening is a vacuum supply and the other does to the distributer advance. Question- is this thing worth a damn ie: do I go find a replacement or just screw in a regular vacuum for the disctibutor that till not be Thermostatically controlled??? I dont know what the benefit of the temp control on this thing is??
 

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They were plummed in a few different ways, but generaly they the were connected to supply full manifold vacuum to the distributor if the engine tempature got above 220-230 degrees. Its a early emissions device, and one of the reasons emissons equipment got a bad mame. In other words loose it.
 

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hmmm, that doesn't make sense to me. If temps get too high, i would expect that timing should be reduced, but if that switch supplies full vacumm, then that would mean increasing advance, no?
 

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The thought behind advancing the timing was to increase the rpm at idle and thereby increase fan speed. At least that's what I read. In real life I'm not sure that will help things that much.
 
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