While most spark plugs require a ⅝-inch or roughly 16-millimeter socket, others use sizes ranging from 9/16-inches or 14-millimeters to ⅞-inches. Let's dive in and explore spark plug sockets ...

Spark plug size is critical in many respects. As well as having the correct threaded section to fit the cylinder head, a spark plug’s internal dimensions are crucial to ensure it doesn’t poke too far ...