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Some Ford cylinder heads have an extra "step shaped" material above the spark plug hole. Since the 55518 counter bore tool is included in the 5553 and 5600 kits; we recommend these two kits for 2001 and up applications. The Calvan 38900 does NOT have a counterbore tool and is not designed to be used with Time Sert's 55518 counter bore tool. Using the Calvan 38900 on heads with this extra step material could result in the insert/spark plug riding higher in the hole. This would mean that th …