404 Errors and Penalty

[undoIT]

I have a site that has many pages. The site is regularly updated. Sometimes pages need to be replaced with entirely new content because the old content expired. In this case, the title, content and URL all need to change. Because there are so many new pages being added, the 301 redirects would really pile-up. I have an XML sitemap that is updated every time new content is added or replaced. It doesn't make sense to leave expired content live, but I also don't want to cause a penalty by removing pages that are no longer valid. Would having regular 404 errors from expired pages that have been removed cause a penalty with Google for the pagerank on the site?

 

[Richardvd]

A few years ago a have changed all file names of my website, the pagerank of my site is not changed. Changing and adding content of your site is good for your position in Google.