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flatjack9 · 11-15-2019, 12:20 PM

I measure .710 to the end of the threads and .750 to the end of the plug cylinder. According to NGK literature, reach is defined as the length of the threads. Is this an industry standard? I also understand that a 1 piece spacer is ideal, but is there a problem with stacking them to the desired height?

11-15-2019, 12:20 PM	#113
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,526	Re: Spark Plug Protrusion into Head? I measure .710 to the end of the threads and .750 to the end of the plug cylinder. According to NGK literature, reach is defined as the length of the threads. Is this an industry standard? I also understand that a 1 piece spacer is ideal, but is there a problem with stacking them to the desired height? Last edited by flatjack9; 11-15-2019 at 12:37 PM.