Can you elaborate? I've read just about every 603 post on this forum and a couple others and I've yet to read of a 603 that coughed up a chain... other than because the vacuum pump disintegrated.

70s and 80s V8s will wear chains especially single row 116s. Some 602s had sprocket and chain problems. Maybe a 617 or two but I'm sure that's because of poor maintenance and the sheer number of them getting up in miles.

Sixto
95 S420
87 300SDL