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Why do the new replacement spark plugs have 8 threads when the old plugs only had 5 threads?

April 26, 2017plugs replacement SPARK threads

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Why do the new replacement spark plugs have 8 threads when the old plugs only had 5 threads?

1 Answer

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Ford now only sells long thread spark plugs. If you try to install a ½ thread plug (5 threads) in a full thread late model cylinder head you will damage the threads. The new full thread spark plugs will fit both designs.