What is a 6 pack in the hotrodding world? Does it improve performance of my engine?
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A six pack usually refers to the Chrysler (Mopar) carburetor setup which is three-two barrel carbs on an intake. You'll most often hear of it as a 440 Six Pack, the 440 referring to the Big Block Mopar engine displacing 440 cubic inches. Here is an image of such a setup:
The interesting thing about these is they are setup sequentially, where the main 2-barrel carb will be used at first, then when the throttle is down enough, you'll get the other two carbs to open allowing for a large rush of air/fuel mixture.
This setup up can improve performance of the engine, with one caveat: only if the engine can utilize the increase in air flow. You can put as large of a carburetor on your engine as you want, but if the engine cannot utilize the increase, it will become a dog and will not perform. Other items such as increased exhaust flow (ie: headers), head port work, and large cylinder displacement will be need to fully utilize such a setup.
There is another common setup called a Tri-Duce. This was General Motors' version of this setup, but worked much the same way. You could find the Tri-Duce mainly on Corvettes and Pontiacs