Looks like Ron is correct and I'm wrong because NGK say the same thing as
Ron. My excuse is that I live a long way from mountains....
_http://www.ngksparkplugs.com/tech_support/spark_plugs/p4.asp?mode=nml_
(http://www.ngksparkplugs.com/tech_support/spark_plugs/p4.asp?mode=nml)
That said if the plugs don't foul don't go to a hotter heat range. If they
are fouling I'd still go a range at a time. On the NGK web page they advise
how much the heat range changes per grade though how you work out the chamber
temps I didn't find.
A factor on whether or not you need to change grades will depend on how
close or not you are running to the optimium range for that grade. An NGK6 is
already a fairly warm plug (I have NGK 8s in my road car).
Weslake-Monza 1330
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