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Originally Posted by pbgbottle
where does vacuum secondaries and mechanical secondaries fit in this topic ,and does it make a difference? just thinking out loud , doesn't the Q-jet only sucks what it needs . versus mechanical always opening up no matter what .
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Howdy! Good question. As I recollect, vacuum setup is less aggressive, and perhaps more economical. The mechanical ones are adjustable, and you can feel them when they "kick in". Back in the 60's when I was a crazy hotrodder, I spent a lot of time working on Rochester Quadrajets. Nowdays, I think they are actually made by Edelbrock. Still pretty much the same as the originals. Both old and new are a darn good carb, but a lot more parts and $$$ than my Carterbrock. John