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Re: Lincoln 5.4 4v Spark Plug Rethread
Posted to Technical Discussion Forum on 11/26/2018 1 Reply

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...I thought it was one of those ridiculously LONG plugs...with the extension that continues over an inch and a quarter past where the threads stop...then I noticed where the single ground electrode WAS (in photo #1) ...then noticed the 4 valve mention..... Login to read more.

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