FORD TRIPLE OVERSIZED SPARK PLUG REPAIR M14x1.25 p/n 5600 The kit will repair holes as large as .730 inches by installing a special oversized insert, that will accept our 3/4 reach TAPER SEAT M14x1.25 BIG-SERT insert. TRIPLE OVERSIZED JUMBO SPARK PLUG REPAIR KIT FOR FORDS Where a previous repair has failed.