Spark plugs - keep these or swap?
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,669
The ground electrode on that plug is pretty damn tough. It would take a fairly substantial blow to change the gap. If the box they came in is pristine, the chances that one or more of the gaps has changed are slim and none. I've never measured one. I take them out of the package, lay them on the work bench, and make sure they look the same. Add a little dab of never seize and in they go. I know adding never seize is blasphemous. Just shoot me 
Le Mans Master
Joined: Dec 2005
Posts: 7,002
Likes: 1,687
From: Southeast TX
And If I see a new plug that obviously bad, I won't change the gap and I won't measure it. It's going back from whence it came.
Last edited by old motorhead; Dec 3, 2023 at 11:32 AM.
