Quote:
Originally Posted by alanwoodieman
manifold also used in trucks 8rt, which required a large vacuum port for the two speed rear gear changer and sometimes a booster for brakes. other port is for wiper motor, remember this maniflod came equipped with a carb with a vacuum port located on cab for the load o matic distributor
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Ditto on the wiper motor. Looks like the right size port not only for a truck rear end but for a Columbia rear end too. Here's a picture of a Columbia rear end vacuum plate from an old
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