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We had a recent customer that asked this question.Question - I need a big sert for a 2000 Chevy Silverado 5.3 . Stripped insert already or damaged not tightening. Which kit do I need to fix the head bolt threads on a 2000 Silverado with a 5.3 for a second time repair when a Helicoil has failed? Answer - The oversize kit for a second time repair when a Helicoil has failed, on a 2000 Chevy Silverado with a 5.3 Liter which uses an M11x2.0 head bolt size is the 3700BS. For others …