Hmmmmmmmmm, have finely drilled holes up through the threaded section of the plug. The injection can come out in a fog centrally located with the spark plg dead center in the fog...........
Me like this idea.... Extend the steel above the socket part, have it drilled like a banjo bolt, have a fuel rail slip over and tighten over each section, then have the electrode come up a bit higher for the wire to connect free of the fuel rail........
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