Roger Lee Posted September 10, 2010 Report Share Posted September 10, 2010 Read that Plug.pdf Understanding heat ranges: http://ngksparkplugs...p2.asp?mode=nml The heat range chart. What do the numbers mean. http://www.ngksparkp...rtnumberkey.pdf Here is another link by NGK on reading plugs: http://www.ngksparkp...aqs/faqread.asp Link to comment Share on other sites More sharing options...
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