Just a shot in dark but free advice is hard to come by. Check your P.C.V. valve, if it's partly stuck closed it will make a loud ticking . If it's not that, it could be one of your lifters has indented down creating slop in your rocker arm's. It also could be one of your rocker arm nuts have loosened. Pull the valve cover's off and check it out, valve cover gaskets aren't that much.Good Luck.