Takeda

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:


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darkstar_420

hopefully they work because i got the 515s LOL

Takeda

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...

darkstar_420

yup they told me they used the nickel anti-sieze

Purplehazeir

Great info and photos Bob! Thanks a bunch!

Takeda

Thank you Kevin!!

4door

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

Takeda

Thank you Robert!

Trent

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

KLC

Sure not much difference.