rniez Posted December 31, 2022 Share Posted December 31, 2022 I am wondering what size spark plug is correct for a Model N or S ford. I think they are 3/ 8" thead but have no documentation stating that is correct. Link to comment Share on other sites More sharing options...
Layden B Posted January 1, 2023 Share Posted January 1, 2023 As Treasurer of Spark Plug Collectors of America, perhaps you can explain what 3/8" thread is? Link to comment Share on other sites More sharing options...
bill witmer Posted January 1, 2023 Share Posted January 1, 2023 Our model N Ford uses 1/2”pipe thread,the same as the model T Ford uses. Happy New Year. 1 Link to comment Share on other sites More sharing options...
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