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Yardbird, in about 1966 a friend, who built hot air heating systems, made a hat, like you described, for my dual quad 389 that was ducted from the heater inlet housing in my 63 LeMans. With no other changes, I went from a 12.14 to 11.71.
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wow thats sum gain!!
i realy thought more people would be doing this if it was that big of a plus
i guess as long as your not restricting the flow all should be good