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The owners manual for the 2003 F-150 shows the spark plug gap for the 4.2 L V6 engine as ( .052 - .056 inch ) but www.motorcraft.com ( one of Fords websites - which states it's updated daily ) shows ( .044 inch ) spark plug gap for 2003 to 2005 F-150 - 4.2 L V6 engines

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17y ago

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