Wow, I just thought he was gonna say "PCV valve".
(I apologize for that off-topic material; I'd just gotten done duking it out with a bunch of hoses under the manifold.)
After seeing those pictures, I can see how the thread title applies... That's a lot of effort. That being said, and in my wish to not take up more space in this thread, I'll say in this edit (in due defense of mechanical engineering types) that Trevor's statement below that begins with "Designers..." is spot on.