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Well if this is the second one that has gone in ten years, and this mechanic keeps pulling it from used cars, they might just keep going bad...valves are generally something you should buy new, but then agian being a teen with a Porsche is hard so its your decision and all, but make sure the used one was better than the one in your car, and not going to do the same thing in a couple of weeks. Also make sure that it wasn't just an afteraffect of something really wrong in your engine, like a bunch of metal bits getting in the system and sticking the valve open or wrecking it up so it is disfunctioning.
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