Posted by Mike on 5/2/2008, 7:03 pm, in reply to "GT6 racing spark plugs"
65.2.90.89
NGK BP5ES, no problems. The "5" heat range worked best for my car.
--Previous Message--
: I was recommended by my engine builder to
: use Champion C57 but they only seem to
: last a weekend (2 hours) racing and
: then the engine starts spluttering
: above 5000 rpm (I can go up to 7000
: rpm). I replaced them with regular NGK
: plugs and every thing works fine. What
: plugs do you racers out there use?
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