Calvan 11/16″ drill bit used with air ratchet and 1/2″ socket.

DenLors tools has sold hundreds of the Calvan spark plug repair kits and has had no reported failures. We’ve answered many questions about Ford spark plug thread repairs over the last couple of years and have included them in various places on our site. Now in this auto repair blog ALL of the frequently asked questions to date are posted here in one central location, if you don’t see your question answered, feel free to use the comment form and ask. Included here are questions about repairing spark plug holes after Lisle, Napa, Auto Zone, or other brands may be thicker than the Heli-Coil, but still have managed to fail and allow the spark plug to blow out AGAIN. We are not out to discredit any other spark plug insert company, we just know from our customer feedback what works and what just works for awhile. The questions below answer questions from real customers with this serious problem. We recommend the Calvan Ford spark plug insert repair kit as the best solution for Ford 1998-2004 4.6, 5.4. 6.8 SOHC (2 valve) engines, the following will help show why.

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