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Discussion Starter · #1 ·
I just replaced the spark plugs on my ‘07 Sport Trac (4.6). I did get them all out with none breaking. I just noticed that I installed the wrong part #. I was supposed to get Motorcraft SP 547, the part store gave me SP 546, I didn’t notice until after they were installed. The truck runs just fine. The 546’s are for a 5.4 instead of a 4.6. What is the difference? Do I need to change them to avoid long term damage?
Thank you
 
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