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They only flow 1300 if you flow them a 3.0 inches like 2bbls aree flowed. If you flow a 6pk at 1.5 like the 4bbls are then it will strugle to flow 1000 cfm, or about the same as a good T-quad and you are still stuck with a 6pk manifold, a simple adapter can fit a t-quad to just about any manifold.

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Good point to about, Dave! I was wondering why when you increase the cubes, especially 440 strokers, you get an abundance of
low to midrange torque and decent mileage (provided the cam, compression and ignition timing
are correct for the combo)in a middle weight chassis (B-body stripper model) with the six pack induction.