CALVAN TOOLS 3 Valve Ford Triton Insert KitPART# 39300Features and Benefits:Designed to aid in the repair of a common problem in the Ford Triton family of motors. For use on three valve 5.4 L and 6.8 L engines built before 10/9/07 and 3-valve 4.6 L engines built before 11/30/07. For use in years 2004 -2008 Ford, Lincoln and Mercurys. The spark plug tends to break off in the cylinder head during maintenance. If this problem is not repaired properly, it can result in damaged or unusable spark plug threads and in extreme cases the possibility of a spark plug blow out. Repair those damaged threads or blowouts in 30 minutes or less per cylinder. Part No. 393-100 Replacement InsertsInsert size: m16-1.5 Click Here. Double your traffic. Get Vendio Gallery – Now FREE!