Spark plugs

dartlove said
So maybe I have the wrong plug all together?

What's the number on the shell? That's not a 10mm thread. Looks like 14mm to me.

I may be wrong. There may be cylinder heads for Chrysler's that use that 10mm plug. I've never seen any. But doesn't mean they haven't been made.

With the number on the shell we can know more. Is there any numbers on the porcelain where the boot slips on?