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Will F20B6 spark plugs NGK ZFR6F-11 fit K20A6?

dandreye

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Accord 2L MT (CL7)
Hi All,

I have a set of 4 barely used leftover NGK ZFR6F-11 spark plugs for my previous Accord with F20B6. Are they safe for use in K20A6 too by chance? It's NGK ZFR6K-11 designed for K20A6, so the only difference is in the letter after "6", which refers to "Firing end construction" as can be seen attached. They look the same in the pictures but perhaps I'm missing something?

Thanks in advance!
 

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