No, those are special units designed for heavy duty and towing applications. I avoid them for high performance use but have blocked all the additional secondary passages off and tuned them like a conventional carb a few times when they weren't being used on HD trucks or motorhome engines.
Since they are somewhat rare and very good when used for big block 454's for motorhomes and heavy duty towing applications I typically save those cores and build them for those set-ups.
Be advised that they take special gaskets that are different than non-motorhome units and they will not function correctly if/when the wrong gaskets are installed in them........Cliff
