1994 Honda Accord Clanking noise near or inside engine

Turned on my accord in the morning and a very noticeable clanking noise starting coming from the left side of the engine, the night before the car sounded fine which shocked me the next morning. I thought it might of been the power steering pump or the alternator belts but it wasnt and I checked the rods and rocker arms on the top of the engine under the valve cover and they were tight so im really at a loss as to what this might be. Though the car makes this noise the car runs the same and does not overheat. Give me an idea if you know what this might be. Thanks