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Old 05-22-2013, 07:31 AM   #5
Tom Wesenberg
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Join Date: May 2010
Location: Mpls, MN
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Default Re: Is there Difference between Champion 3X Spark plugs

The diamond knurling pattern stands OUT on original plugs and they go IN on the repro 3X, plus the knurling doesn't run all the way down on the modern 3X.
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