I wish that I could take credit for the work, but this came from the PTCC forum. Bob Stockum did all of the work, all I did was figure out how to get it posted here. But it illustrates why its hard to find other plugs that fit. These plugs are the same plugs that go into the V6 minivans (so I have been told). DC must have had to do the counterbore strictly in order to use these plugs. Like I said, i don't care for champions but these seem to be working great AND THATS ALL THAT COUNTS !!
Alan