Originally Posted by Frank Reiner

1) Are you able to describe what was shown to you in the photos of "bent valves"?
2) What were the circumstances that only photos were shown to you, rather than having the actual evidence pointed out to you, i.e., having the mechanic and you stand by the car as the mech shows you the evidence?

3)If you consider exchanging the engine, a 4.2L (420 SEL) engine will use your existing exhaust system. A 5.0L engine will require an exhaust system from either a 500SL or a 560SL; the bolt patterns on the heads are different, and the block height & width is greater.