Ok so i've noticed this ticking sound for the past month and it seems to have goten worse. Sorta sounds like it's comeing from the header. Do you think i need to get a valve adjustment? As far as i know its never had one. I plan on doing it myself, but if it's only like $50 i might have someone else do it. I don't really have time right now to do myself. Does anyone know what it would cost?