I switched to NGK; note the difference of the heat ratings for NGK vs. Bosch plugs,
If you run an NGK you should use 6's or 7's.
I have an MSD system and wires and run 6's.
http://www.ngksparkplugs.com/tech_support/spark_plugs/index.asp?mode=nml
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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; 09-21-2008 at 12:51 PM..
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