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Most 3 carb setups use one carb in the middle as the primary and kick in the other two as secondaries. This changes the fuel flow path with an inline six and log-style manifold because the primary is usually in the middle of the manifold, and the other two are at opposite ends. There is quite a bit of difference in fuel path/flow length to each cylinder when the secondaries kick in.

You can also try to build a manifold with more equal length runners to each cylinder, but its hard to make one that holds multiple carburetors and still keeps runner lengths close to the same.

Bruce
 
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