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Premium Member
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5,265 Posts
Not sure about these plugs in particular but I can tell you that some of the guy on the site have tried different fancy plugs like these (splitfire, platinums etc etc) and they do not perform as well in our Broncos as the good old Autolite or Champion plugs. Some guys have even replaced the fancy schmancy ones with the cheap 99 cent a piece ones...
 

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A D M I N in training
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2,996 Posts
When I did the sixliter tune-up, which I strongly recommend u do, I use the diamond fire spark plugs and was not impressed and I wish I saved mah money and bought the cheap plugs.
 

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11,042 Posts
The cheapest, junk copper plugs you can find are what works best on these Ford motors.
 

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A D M I N in training
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2,996 Posts
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