What would be some signs I should be looking for with stock plugs ....I run 93 octane the tune is for 91 octane......I don't get any pinging sound and from my data logs btdc is around 20-25 at 6k-7k rpms.........also ...this might be a dumb question but from my 350z I changed stock plugs to 370z plugs (one step colder) and was running 8lbs ...wouldn't the 370z be similar at 8lbs ...as far as plug heat range ?
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