Frequent content changes - do they matter?

Does Google filter URL's with frequent content changes?

[Whitey]

Last year we completely changed the content on 2 of our 9 websites.

Since then, our pages indexed within 4-8 weeks, but no results have re appeared in the SERP's, indicating that we are heavily filtered. All of our other sites are fine.

Does Google filter website's which have gone through a complete content change? What's the evidence?

[tedster]

Content change alone shouldn't do it if the site is already healthy, at least not today. Now, if the site was already weakened by low trust for some reason, then I can see a kind of testing period being thrown at it. This used to happen even for single pages.

I recently helped with several full redesigns, and those sites did not have the problem you describe, Whitey.