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Spark plug letter

I finally found the spark plug letter stamp. It is real obvious once you know were to look. Just look straight down from over the center spark plug with the coil pack removed. Here is a video for those who are having a hard time finding it.
 

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Sorry to revive an old thread again. I have an Insight that I bought Oct. '21 with over 180k on it. I am assuming the plugs have never been changed and planning on doing the Autolite XP5325. I just want to confirm that these have still stood the test of time, and wanted to know if I could get away with a 4 pack, or if I need to do the 6 for a better chance of getting ones that sit in the correct orientation? My engine is stamped B fwiw
 

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I used the Autolites once. It was quite a few years ago but I think I bought six or eight of them. They worked fine. I suggest you buy them from two or more sources so you have plugs from different manufacturing runs. I think you would have a better chance of having different thread orientations that way. It's just a suggestion though. I don't know how they do the production run.

I don't think you have to be all that accurate with the orientation. My guess is that you can have maybe 270 degrees where they be good and will ignite well; If they are at the bad 90 degrees the negative post will make a flame shadow.
 
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