DenLorsTools.com Summary: Help finding which oversized spark plug thread repair kit to purchase. Spark plug holes that are made too large for regular thread repairs are usually caused by parts store brand thread repair kits that have failed. When the parts store type inserts don’t hold and the spark plug blows back out again the hole is left even larger than before. This requires an oversized thread repair kit. Sometimes the double oversized kit is not big enough. Fortunately, we have a triple oversized kit that repairs even the largest holes up to almost 3/4″. The inside still accepts the regular M14x1.25 spark plug.

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