Parking and indexed pages

[ChicoSuave]

Hi guys,

I want to park a few domains using my own host and a frame redirection system in order to check some stats. However, I was wondering if there's any strategy to avoid that the pages indexed in the search engines (from the former websites) get deleted once the spiders come to crawl my new parked site.

Thanks for your thoughts on this...
ChicoSuave