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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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HotRodDave has it right. According to the resident Mopar junky over at Hot Rod Magazine (David Freiburger,) in terms of 4-barrel air flow the mighty Six-Pack flowed closer to 975cfm because 2-barrel carbs are rated using different specs.

Throw on a street tuned Holley 950HP on an Edelbrock Performer RPM intake and there you go...

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But being so close in airflow, would the six pack
have more flow capability upstairs? Due to the two extra venturis? Or not.