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I believe what you are describing is a backfire device, but I could be mistaken...



Actually it is a hot idle compensator and not on a 68 carb,also,to SCG,there are mixture screws behind the plugs.Here is one with the plugs removed and mixture screws installed.



any real benefit to this? It will eventually get replaced with a holley so I don't know if I'd bother with it. Plus it takes away from the resto factor should I get to that point.