NGK aka NFG hope you didn't put them in a OMC motor Johnson Evinrude motors like and run best on Champion most use L77JC4 best place for them is alsom O'Reilly's
let me just say the NGK is one plug i hate and see more problems with than any other to me they are the junk plugs of the market.
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1978 V20 Cuddy w/ 225 Johnson. And Several other boat's
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