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There is no garentee that a 301 will pass links juice. If you try to redirecet one website tothe other there is a good chance it will not pass link juice unless it is the same content. meaning switching domains. simpley 301 redirecting to the home page with also see the links dissmissed. Thyere is a matt cutts video thats points out that you can not take it for granted that they will pass the link juice, it has to be an honest legit rerason to redirect. but i have never heard of it hurting