Dean, thanks for the reply. I'm sorry, I didn't check my PM.
The car runs great.. and very smooth after startup and even after the short few seconds of clattering noise.
During the clatter, there is no ruff idle or engine shake. You can hardly tell the engine is running once started. My only observation would be it seems the engine takes longer to start, but I have been my impression from the time I purchased the car. It seem like the longer start times are more common for M119 engines form what I have read - but correct me if I'm mistaken..
Upon occasion the chatter has occurs during the morning starts, but it's more typical and pronounced after the engine has reached operating temp and sat for a few hours. If the car is stated within a few hours, the chatter never seems to happen. The "somewhat" random nature of the problem is puzzeling me.