Since a lot of people with the FS-DE engine have been having oil starvation problems, Beau has removed the oil pan from his spare engine and is designing a new 5qt pan to go into production in a few weeks. If anyone is interested in it, please subscribe to this thread so that I can handle your questions and any comments you have. If you are able to take pictures of an aftermarket header that you are concerned with clearance, please post that too.