Originally Posted by KRosh

The 993 has a non interference motor. It is very difficult to bend a valve.

Can you give some more details? What was the actual sound? was it a metal clang? what do you mean by pop? did you hear any metal clanking sounds after?

Where you able to shift into other gears? When you were turning over the engine after it stopped can you describe the sound? did it sound like the normal cranking that it always does?

I used to work as a German repair specialist and might be able to help