The best way to find stuff in the forums is to use Google as your search engine and not the forum search functionality. The key is to use the "site:" keyword.
For example, if you wanted to search for how to rebuild injectors on a 617 engine, you could use the search term
site:peachparts.com injector rebuild 617
You can use multiple search terms to get really specific. This is also a great way to search for images that have been uploaded to PeachParts.