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Bored&Stroked · 11-02-2019, 12:58 PM

If that plug is tight/seated, then if anything, it is too short. Your plug threads are nowhere near the full depth of the head. I like to have the bottom of the plug flush with the bottom of the plug threads - with no threads hanging out into the chamber itself.

11-02-2019, 12:58 PM	#4
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,062	Re: Spark Plug Protrusion into Head? If that plug is tight/seated, then if anything, it is too short. Your plug threads are nowhere near the full depth of the head. I like to have the bottom of the plug flush with the bottom of the plug threads - with no threads hanging out into the chamber itself.