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Here is a 350 Chevy intake port with the valve lifted about .300-inches and the mixture flowing at a speed typically generated when an engine is running at about 5,000 rpm. The luminescent blue is fuel. Note the rotating vortex halfway down the port and the fact there is almost no fuel in the top half of the port where it approaches the turn. Fixing a wet-flow problem like this can be worth as much as 25 hp!