When the car is running there is a noticable ticking sound on the driver side of the engine seems to be coming from the area of the headers. Right now im useing a set of MAC copper exhuast manifold gaskets. The sound goes away when I REV up the engine, so i dont believe it is a messed up rocker or lifter becuase they are all brand new. I dont believe it is a blown head gasket either becuase the car runs pretty good, no colant in the oil, no oil in the colant. Can this be a bad header gasket????