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Aluminum head bolt threads pulling out on Polaris engines is a fairly common problem. Installing a solid bushing-type steel insert is the best fix. Avoiding the expense of some of the larger kits designed for automotive applications is a smart way to save money and still get a quality repair. The larger Time-Sert kits, for example, are designed for doing repairs when the threads start down several inches. With threads flush or near the surface, a much less expensive kit made by Time-Sert can be …