old man Posted February 28, 2014 Report Share Posted February 28, 2014 I am replacing the spark plugs on my GTH at 30,000 miles due to the breakage problems they have. Which ones would you use for a stock street motor? The Champion and Brisk are one piece, but the Motorcraft sp 514 is suppose to be improved. which would you use. Thanks Harley Link to comment Share on other sites More sharing options...
JASPONY Posted February 28, 2014 Report Share Posted February 28, 2014 I have 20k+ miles on the Champions with no issues. Link to comment Share on other sites More sharing options...
GTH391 Posted March 1, 2014 Report Share Posted March 1, 2014 I changed mine with the one piece Champion 7989. They cost a crap load more but I am not worried about the breakage issue. I also used anti-seize in the "neck" that extends down into the head. Keep any anti-seize off the electrode. Just smear it lightly on the extension. Good luck and take your time! Link to comment Share on other sites More sharing options...
AKSHELBY Posted March 1, 2014 Report Share Posted March 1, 2014 i replaced mine with the champions last year , no issues so far. My engine is still stock..I used ford antiseize and followed the ford tech bulletin... Link to comment Share on other sites More sharing options...
Lynno Posted February 24, 2016 Report Share Posted February 24, 2016 What is the spark plug gap on the Champion 7989 set at? Link to comment Share on other sites More sharing options...
Larry T Posted February 24, 2016 Report Share Posted February 24, 2016 These are the ones that I am running http://www.americanmuscle.com/frpp-16mm-sparkplugs-0508gt.html Link to comment Share on other sites More sharing options...
Rickys2 Posted February 25, 2016 Report Share Posted February 25, 2016 These are the ones that I am running http://www.americanmuscle.com/frpp-16mm-sparkplugs-0508gt.html The best spark plug out there Link to comment Share on other sites More sharing options...
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