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General Motors GM-39313 Spark Plug Port Adapter Shop by Category > Sand Blasting>Accessories Are you in need ofGeneral Motors GM 39313 Spark Plug Port Adapter Kent Moore Tool Number: J 39313 For General Motors. 98 1 2 INTRIGUE GM 39313 is installed into the spark plug hole and then connected to an air hose to supply compressed air into the cylinder to hold valves against their seat in order to service valve springs or seals without removing the head. For the General Motors Tools Catalog, click here Looking for General Motors Specialty Tools? Rest assured,