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Spark plug and spark firing order for a 1979 4.6L 6 cylinder F150 Custom?

The 1979 Ford F-150 4.6L (actually a 289 cubic inch, not 4.6L which is a later engine size) 6-cylinder engine uses a straight 6 cylinder layout. Therefore, the firing order is sequential.

The firing order is 1-5-3-6-2-4.

Regarding spark plug specifics: You'll need to check your owner's manual or a reliable parts source like AutoZone, Advance Auto Parts, or Napa Auto Parts using your VIN for the exact spark plug type recommended for your truck. The heat range and type will depend on several factors and generic information isn't safe to rely on for this part.

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