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Jim Brierley · 05-16-2018, 02:13 PM

Normally with higher compression the engine needs a colder plug but I think your present plugs should be about right. 6:1 is not very high. Plugs should be read after a medium length run, and not idled at the end of the run.

05-16-2018, 02:13 PM	#4
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,084	Re: Would you recommend a hotter plug? Normally with higher compression the engine needs a colder plug but I think your present plugs should be about right. 6:1 is not very high. Plugs should be read after a medium length run, and not idled at the end of the run.