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For a 2002 F150 5.4 L engine : Engine code L or Z - .052 - .056 inch Engine code R ( Harley Davidson ) engine code 3 ( lightning ) and engine code M - natural gas are .042 - .046 inch THE ENGINE CODE IS THE 8TH CHARACTER OF YOUR VIN ( according to www.motorcraft.com )

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Q: What is the proper spark plug gap for a 2002 Ford F-150 5.4 V8?
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