corbitt; Not in terms of "cost effectiveness". To backfit a double-row chain to an early 380SL is about a $6k job since it requires engine out or at least a front end dismantle. If I had a single-row engine, I think I would prefer to simply plan a preventive chain replacement every 50 to 60k miles at a cost of less than $1k..

Note: '84 and '85 380SL had factory dual row chains.