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Spark Plugs for the 912


NC Bill

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I just bought the plugs for my annual - the NGK DCPR8E.

 

But I notice that these are marked 4179 while previously I used 4339.

 

What I've learned on the internet is:

NGK 4179 DCPR8E
   Gap      .036” (0.9mm)
   Terminal type   Solid

NGK 4339 DCPR8E
   Gap      .028” (0.7mm)
   Terminal type   Removable Nut

 

Are the 4179 interchangeable with the 4339?

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