2004 - 2007 F-150 Spark Plugs
 

The original 2004-2007 F-150 5.4L spark plug is the SP-507. This spark plug was replaced with the SP-515, supposedly to help the seizing/breakage problem the SP-507
has. I bought one of each part number, just to see if I could see a difference in them. Both plugs appear to be 3 piece, with the threaded hex nut welded to the lower GND
shield that extends into the combustion chamber. The only difference I saw was the GND shield is slightly shorter on the SP-515, as can be seen in photo #6:


1
http://bob-ayers.smugmug.com/Other/F...6_hLnLm-X3.jpg


2
http://bob-ayers.smugmug.com/Other/F...7_mMQ9M-X3.jpg


3
http://bob-ayers.smugmug.com/Other/F...5_FJ4YZ-X3.jpg


4
http://bob-ayers.smugmug.com/Other/F...7_ugtWH-X3.jpg


5
http://bob-ayers.smugmug.com/Other/F...6_YofAk-X3.jpg


6
http://bob-ayers.smugmug.com/Other/F...7_4avQW-X3.jpg


7
http://bob-ayers.smugmug.com/Other/F...2_w35KJ-X3.jpg


8
http://bob-ayers.smugmug.com/Other/F...1_FB7JW-X3.jpg

hopefully they work because i got the 515s LOL

Hopefully they used the Nickel anti-seize on the GND shield when they
installed them. I'm sure I will use the SP-515's when I replace mine...

yup they told me they used the nickel anti-sieze

Great info and photos Bob! Thanks a bunch!

Thank you Kevin!!

Yes thank you for posting these pics,& all the great info.....Robert:sign0184:

Thank you Robert!

Well shucks, I wish I had known this 2 weeks ago before I replaced mine. Thanks for the info Bob

Sure not much difference.