1967 Ford Thunderbird Spark Plug, 430

The correct gap, no-corrosion, and proper-threading are qualities you want to see in your spark plugs. Any one imperfection in your spark plugs robs voltage from the spark, and that decreases your engine's combustion strength exponentially. The end result is slower combustion, diminished brake horsepower, increased pollution, and carbonization that bonds to the inside your cylinders and exhaust system. These spark plugs will work with your Thunderbird's 430 engine to put the voltage into the spark, and

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