The wrecking yard guy keeps telling me 'direct replacement' on the phone and seems to think there will be no modifications needed.

guess I will have to run down there today and get a look at the engine myself. I heard Mercedes didn't wait to reveal new features or designs for a new year but implemented improvements as they were engineered. I wonder if some early '77 cars were still w155? For example, my 1975 240d was manufactured in Sept. 1974, yet it is titled as a 1975. I will go have a look at the motor today.

What do you all think of the video? Does the engine sound like a main or rod bearing?