I'm working on a 1984 380SL and have changed the timing chain and guides. Upon replacing the sprocket to the cam, I noticed that the TDC marks on the cam did not match the 0 TDC on the vibration damper. I had assumed that I had somehow let the chain slip on the cam, so I removed the rocker arms, reset the cams to TDC with the vibration damper and reinstalled the rocker arms. To my shock, I found that the TDC for the #1 and #6 were not at 0 TDC but at 270 degrees; 90 degrees off! I verified that #5 and #3 were at TDC at 0 TDC, so the million dollar question is how can the crank get 90 degrees off?