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WiseAutoTools.com Summary: Wise Auto Tools provides spark plug thread repair kits to fix stripped or blown out spark plug threads in Ford 3-Valve engines right over the fender. There's no need to remove the head. These kits are suitable for spark plug sizes other than 14mm, such as 12mm and 16mm. The Time-Sert 3221 Spark Plug Thread Repair Kit is recommended for Ford 4.6 and 5.4 3 Valve spark plugs with M16x1.5 threads, applicable to most 2004-2008 Ford 5.4 3V engines, and fits 4.6 and …