235 engine, I adjusted the valves, and checked them again today, and they are all spec ok. .006 and .018. I'm hearing a clicking ticking sound that sounds louder than valve clatter, but only at one particular relatively low part throttle rpm. It sounds like something is loose, or rattling around, Almost a clank, but only at one part throttle setting. But that, of course, is normal drive down the road speed. Any ideas or suggestions what to check next?
