Do I have to change the valve seals when repairing a GBU?

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Cylinder head perhaps? You need to watch how they stretch. For example, my repair turned out to be bone \r\n\r\n generally almost crumbled in places.Sometimes changing the factory which are for a long time and remain soft to shop for one, and they quickly fail. That is, if they are native and not calloused, it is better not to touch. And if you already menany was it possible for one to change, again for quality. Cheap parts cost more.
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