The Time-Sert 3221 Spark Plug Thread Repair Kit is for Ford 4.6 and 5.4 3 Valve spark plugs with special M16x1.5 threads that accept Autolite HT or MOTORCRAFT PLATINUM PZT spark plugs. Applicable to most 2004, 2005, 2006, 2007 and some 2008 Ford 5.4 3V engines (also fits 4.6 and 6.8 3valve engines). (Note that some 2008 models and newer may require a different kit due to a difference in the seat. Newer 2008's and up may use a special M12x1.25 Taper seat plug.) Kit comes with 5 inserts, more available separately. 

 

*This is not recommended as an over the fender repair due to the long pilots on the reamer and tap, there is a possibility of the pilot breaking off and falling into the engine. Performing this repair on the vehicle can be done successfully, however it is done at the users risk. See the video below to get a basic idea of how the Timesert thread repair kit works. Also full pdf instructions which are printable are available at the following link. Click here.