spark plugs and boots for a 2008 F150 5.4
#1
12-21-2017, 05:36 PM
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#2
12-21-2017, 05:56 PM
Black boots or brown boots? Makes a big difference. Heads were redesigned mid-year 2008.
Old style black boots: Motorcraft SP546 plugs, Denso 6718164 boot/spring set
New style brown boots: Motorcraft SP509 plugs, Denso 6718172 boot/spring set
Old style black boots: Motorcraft SP546 plugs, Denso 6718164 boot/spring set
New style brown boots: Motorcraft SP509 plugs, Denso 6718172 boot/spring set