blowout

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    What's A Good Spark-plug-thread-repair Insert?

    Hi all. I have a blown-out spark-plug hole that was repaired with a helicoil. Looks like that repair is failing. Saw some posts about a Cal-Van repair kit, but they don't make an insert that works with the 4.6L Cobra. Does anyone know of a high-quality oversized insert like Cal-Van's that will...