Changing Wordpress Pages to Posts can I do it with no affect to SEO?

Basically the theme I'm using is more user friendly with some neat CSS on posts. I want to to make the urls of the posts exactly the same as the pages with all the same content and then simply delete the pages themselves. I've built a few links to various pages and don't want them to be worth nothing if I do this. If it's the same exact url it should still count ya?

bumping

It will have little to no effect on SEO as long as the URL stays the same.

You can keep the pages and add posts. When your posts rank then delete the pages

the search engines don't see a difference between a post and a page; even wordpress itself sees no difference in "pages" and "posts" (all content is entered into the database as a post).... this is just a naming convention that wordpress uses to make it easier for users to understand the content they're creating for their sites. Create a post before deleting your page, then compare the output code using a tool like winmerge or beyond compare. If the content within the code remains similar (proper titles, metatags, keywords, etc.) it shouldn't affect how the serps process / rank your page.

Be sure the post has the same URL as the page and you will be fine. You can easily change it in Wordpress an it will ensure you don't lose any of your previous backlinks.

Also make sure the meta title/description of the post is the same. It shouldn't be a difficult transition.