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After its Quadrajet carburetor was removed, the effects of reversion can be clearly seen on this intake manifold. Note the "cleanest" area of the plenum is in the one of highest exit velocity of the carb; on the primary side and nearest the upper plane's plenum floor. The slower-flowing secondaries and lower plenum floor for the other primary throttle opening all create less flow resistance to reversion. That allows for deeper re-entry into the intake manifold during periods of reversion. View Related Article
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