06-15-2014, 08:32 AM
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CC Member
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Join Date: May 2006
Location: Denia / SPAIN,
ESP
Cobra Make, Engine: NAF 289 Blue/White strips
Posts: 188
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Not Ranked
Question about spark plug heat range
After doing new valve job, intake to head matching, some head porting and carb adjustment, I am looking for the spark plug heating range.
After a 60 miles nice flush ride on mounten and back roads the outcome is:
AC Cobra 289 NAF - YouTube
Left plug is NGK BPR 6 ES (cyl. 6)
Right plug is NGK BPR 8 ES (cyl. 2)
There is nearly no exhaust soot on side pipe end.
Which plug would be better?
Rico
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Rico, NAF 289
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