Found this excellent explanation:
http://www.ngksparkplugs.com/tech_support/spark_plugs/p2.asp?mode=nml
It appears that NGK lower numbers mean higher temps as stated above I guess that explains my issues with the 4's.
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78’ SC 911 Targa - 3.2SS, PMO 46, M&K 2/2 1 5/8” HEADERS, 123 DIST, PORTERFIELD R4-S PADS, KR75 CAMS, REBEL RACING BUSHINGS, KONI CLASSICS
Last edited by snbush67; 09-03-2008 at 09:52 PM..
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