Quote:
Originally Posted by sav03cobra
I think the SS stock heat range is a 6.
A couple performance sites list: NGK IRIDIUM IX LTR7IX-11 PERFORMANCE SPARK PLUGS HEAT RANGE 7 for nitrous/fi. And I think that’s only one step colder than stock.
So maybe a NGK (6509) LTR6IX-11 Iridium IX?
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Go to a parts house an ask for plugs. The heat ranges on those plugs will be::
Stock AC Delco plug is a "16"
Bosch plug is a "8"
Denso is a "16"
Because I couldn't find a AC Delco heat chart, you have to look at other plugs that we can chart to get an idea of what heat range our plugs are. Based on the Bosch and Denso OE replacements, I concluded our stock plugs are a NGK 5.
