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Power loss over what?

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i should have specified...
a modern 4 barrel

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I dnyo tested my low deck sixpak motor(518 C.I. Pump Gas) with the sixpak and then 30 minutes later a Team G intake and 1050 Dominator, I actually tested three different Holley 1050 Dominators and I had to add a Wilson Manifold 2 inch reversion spacer to get the single, modern, four barrel carb. power close to that old design sixpak on that motor The best dominator on the Wilson reversion spacer made 708 HP and 750 Ft. Lbs and the sixpak made 718 HP and 750 Ft Lbs, same dyno, same day More air with the proper mixture of fuel made more power