It's either a loose rocker or stuck valve on the back side of the pass. side head. Its a loud "ticking" that started silently and has now became louder over time. It's a kind of tick/rattle.

Anyways of disagnosing the problem? and what the heck do I need to take off for that valve cover? lol. it would be the side thats covered up with widgets out the butt, lol.