Real Fake PageRank?

Real is not fake.

Your case, the 302 redirect would not be faking PR.

Check the google cache and the backlinks.

PR flowing from one domain to another is not fake PR.
Any PR push from another domain, would certainly continue
to hold and grow, if one were making backlinks to the old domain.

If that was ever turned off, that would mean that the backlinks
would be gone *poof* and the site would lose PR.

I would not touch that crap with a 10 foot pole.

It's like asking if I buy a PR7 site, and know that in one month all
backlinks will be wiped out, should I buy the domain?

Of course not.

On a side note..concerning how to fake PR

fake PR is not done by a 301, 302, 303,...307 or whatever.
It is done by a script that redirects to a high PR only when
the googlebot is crawling it. All others (humans) see the normal webpage.
Thereby, humans think it's a real page with high PR. What they
don't realize, is as soon as the script is gone, and the script MUST
be gone for google to index it, then the real PR shows up, most
of the time a little later. It can't be done using one of those
redirects, as that would not give the fake PR. 302 to 307 are
just other ways around old code and browsers. The googlebot
does not work like a browser.

It is this short window of opportunity that the fake PR shows up
and hoodwinks people.

No online PR checker, and I mean no online PR cannot be fooled.

Only google owns internal checker cannot be fooled, but google
is not going to make that available, as it would divulge a plethora
of well guarded secrets.

There are ways of knowing whether a site has real PR, for the
most part.

First, the page should be indexed and in the google cache. As
I mentioned above, sometimes this is not exactly perfect. The
google cache might not be updated as the site is redirected.

Second, a quick view of google backlinks is certainly a tip off.
If you see none, or a handful, bingo. Fake PR.

Third, age of website. I see a lot of fake PR sites out there that
are less than a month old.

Paul

Unless you own both domains you don't know how long the redirect will continue to be in place.

I seriously doubt anyone would continue paying for a domain renewal year after year for a redirect to another persons domain.

So you are looking at site A. Site B is the one with the actual PR and it is being redirected to site A.

Is that what you are saying?

In that case, the PR of site A is "real", but unless it has good PR links of its own coming to it, the second that the redirect is turned off, the PR goes away.

If you do not own site B, that means you really have no control over this.

In other words, it would be a waste of money to buy site A if you are buying it for the PR only.