Okay I want to install my headders tonite on my c10 but I dont have any "headder" Gaskets at home. I do however alredy have some manifold gaskets. While searching for the answer to this question I found a reply by divorced I think who said he ran manifold gaskets on his headders. If you can just as easily run manifold gaskets on headders then why do they sell "headder" gaskets at the parts store? Is there any advantage/disadvantage to this?