Thread: What about spark plugs?
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Old Oct 21, 2006 | 07:47 AM
  #17  
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BMEP
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Originally Posted by Geezer1
Whats the difference between IK31's and IK27's ?
The IK27’s are the equivalent heat range of a 9 in the NGK range and the IK31 is a heat range of 10 in NGK.

I use the IK27’s on the street and IK31’s on the strip/track.
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