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 Quote Link to comment Share on other sites More sharing options...
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