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WiseAutoTools.com © Summary: Repair kits available for Chevrolet LS engines which have failed head bolt threads. Sizes include the M11x2.0 for the larger holes and M8x1.25 kit for the smaller M8x1.25. Failed threads in aluminum engines are a common problem today. Time Sert has been making head bolt thread repair solutions for GM for a long time. The Cadillac Northstar engine was one of the first engines that suffered from failed aluminum threads for their head bolts. GM and Time Sert engine …