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WiseAutoTools.com © Summary: Head bolt thread repair kits for repairing head-bolt threads in the cylinder block if done properly can save thousands of dollars compared to replacing engine blocks. Advantages of using Time Sert solid bushing type inserts over a thin coils of wire like Heli Coil uses. Helicoil is the better known brand however, clearly is not the better thread repair system. Both brands have kits for M11x1.25 head bolts which are commonly found in Nissan and Infiniti engine …