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russcc · 06-20-2020, 08:42 AM

Thank you JSeery. That confirms what I found doing some lengthy research. The Champion L78C has a .500 reach. I will get one and see how far the electrode protrudes from the end of the shell. If it's like the Autolite AL-7, the electrode is .120, which will clear the exhaust valve.

06-20-2020, 08:42 AM	#13
russcc Senior Member Join Date: May 2010 Posts: 2,871	Re: spark plug reach Thank you JSeery. That confirms what I found doing some lengthy research. The Champion L78C has a .500 reach. I will get one and see how far the electrode protrudes from the end of the shell. If it's like the Autolite AL-7, the electrode is .120, which will clear the exhaust valve.