Spark Plugs: Fact and Fiction
Most domestic engines use 14mm plug threads with reaches (lengths), as measured from the end of the threaded area to the seat, typically varying from 0.375-0.750 inch. Either a gasket or a tapered-seat configuration is used to seal the plug to the head. The wrenching hex is usually 5/8 or 13/16 inch. View Related Article
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