i have a 87 with the 2.6L. with in the last couple of days its started ticking/ knocking all the time. I mean from the time it starts, and all the way through the rpm range. i decided to take off the valve cover and check things out to see if it was in the head. the first rocker arm on the exhaust side has play in it. all the others are tight and seem to be where they are supposed to be. my question is, would it be just the rocker arms or would it extend to other parts of the head. any help would be appreciated.