In this diagram you see what happens when all 4 barrels are open during hard acceleration. The air/fuel ratio for the rear barrels often is richer than the the primary 2 barrels. As you can see here cylinders 1, 2 and 3 get their air flow from the secondary 2 barrels while cylinders 4, 5 and 6 get their air/fuel mix from the primary 2 barrels. In most cases in this configuration cylinders 1, 2 and 3 will be carrying more load or pulling harder than cylinders 4, 5 and 6. This diagram demonstrates that this is not the best way to position a carburetor on a Clifford intake manifold. The next picture demonstrates the best way to position the carburetor on the Clifford intake.

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