OK, here goes. For 10 -12 years I have silently read about everyone bashing Champion Spark Plugs on here. I have used them on my 1948 Chrysler Royals since 1974 without any starting or running issues. Never had one fail. Never had bad starts, slow starts, unless I neeeded to tweak my Points or Timing (which is probably the real culprit) or charge my battery if my Chrysler sat a month in the dead of Winter and I couldn't take it out every week because of snow or ice. So that being said Champions in my humble opinion are as good as any spark plug out there. I have had AC, Bosch, NGK in my Pontiacs, Chevy's, and Toyotas, and I really can't see any difference at all. As a matter of fact I found the Bosch Plugs ran too hot and didn't seem to do their job if any plug bashing must commence I personally would not buy a Bosch Plug again, however, Champions will always go in my Mopars RJ12C or 592 (Same Plug) at 35 Thousands of an Inch Gap. Running 6 Degrees Advanced on my Timing and always running Ethanol Free Gasoline - never the Cornalhol/Ethanol Gasoline.