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A customer recently emailed us with a great question: “What percent of Kia vehicles would you say have the head bolt stripped?” It’s a common concern for owners of Kia and Hyundai vehicles with 3.3L, 3.5L, and 3.8L engines and it’s no surprise why. Stripped head bolt threads in aluminum engines are a known headache, especially for models using M11x1.5 head bolts (like those compatible with Fel-Pro ES72366 head bolt). Let me provide a little more info on the issue and I'll …