I bought a freshly rebuilt 230ci. Built by a race shop and original owner put 4000 miles on it and did a V8 SBC swap about a year ago. I have not run the engine on my run stand yet. Pulled the valve cover and everything is really clean. However, I found a teeny tiny spring broken off of the #6 exhaust umbrella seal and other seals are either torn or out of position. See photos.
So I have a list of questions.
1. Why did the seals fail?
2. Should I pull the head?
3. What style seals should I install?
4. The engine builder re-used the old valve springs but used shims. Should I buy new valve springs?
5. If I get new valve springs, will I need to break the cam in again?
You can see the exposed sping on the valve stem. This exhaust seal is torn. The #6 exhaust valve umbrella seal is out of place. Another torn seal. 
