Individual throttle bodies are always an advantage because they insure
equal distribution of fuel to each cylinder. There is always some
inequality of distribution in a plenum.
Theoretically having the injector nozzle further away from the valve is
an advantage because it gives more "time" for the liquid fuel to
vaporize into a burnable gas rather than go through the chamber and out
the exhaust unburned. In practice it probably doesn't make much
difference, especially with mechanical fuel injection. Bill H.
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