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DennisB WiseAutoTools.com © Summary: Parts and tooling that’s included in the Calvan 39300 or ATD-5410 3V spark plug thread repair kit for M16x1.5 3-Valve engines and basics on how it’s used to restore spark plug threads without removing the cylinder head. The ATD-5410 is a 3V spark plug thread repair kit that repairs damaged aluminum spark plug threads for Ford 3V engines. The ATD5410 is made by Horizon Tools, which also markets the same kit under different labels, including Calvan, O …