I don't know if this is exactly relevant because I'm taking about a few pages not a whole site but I had a couple of dog pages on one of my sites, just because I like dogs. Totally inappropriate place for them to be though so I eventually opened my own pet site and 301 redirected from the original where they'd been sitting for a couple of years.
Now while the homepage is pr2 and most internals pr1 or even pr0, those redirected pages are a pr 2 and they have maintained for a year or so.
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