Mercruiser 4.3lx 1996, it has rubber grommets with plastic hollow elbows in the valve covers instead of actual pvc valves. Mine leak a little oil around the elbow. It looks like someone has tried to glue them before. My friend replaced his with actual pvc valves from a car. Not sure what they do or how that would affect it. It would be one solid piece and alot cheaper. Any ideas, should i just order new elbows and grommets or actual pvc valves. Thanks jason