When doing a valve adjusment on an air-cooled Porsche 911 you have an opportunity to do a pretty thorough inspection. Once you get the valve covers off you can check each headstud to make sure none are broken. You can also inspect the camshafts to make sure that the lack of ZDDP in modern oils hasn't taken it's toll. In the video below you can see the exhaust lobes of the camshaft looking from the top side of the engine.
To inspect the intake lobes, you look from the bottom of the engine and there are no obstructions or space limitiations so it is easy to see with a flashlight. I use the endoscope for the top side because it can be a bit difficult to get your head in there. When you look down from the top, the intake rockers obscure your view of the intake cam lobes. The opposite happens on the bottom. So even though you are looking from the intake side (top) you are actually only able to inspect the exhaust lobe. It will make perfect sense once you are in there.
These cams looked great and all the headstuds were intact. Only one rocker required re-adjustment. This is one happy little 911SC! If you have questions or comments, give us a call. We'd be happy to care for your air-cooled gem also!