I believe 10* of chain stretch is the limit at least for V-8's, most seem to change chains at about 8* stretch. If you are about 1/2 tooth off due to stretch that would put your chain stretch at a guesstimated amount of 7*. You're close to chain time.
I've done chains on both of mine, used the "C" clip masters. Have had no problems with them. On the 560 I have logged about 20K+ miles since the change.
The inlines seem to require less chain replacement, most likely due to their short travel distance. Remember, with the V-8, the chain is 6 feet long and makes numerous turns as it wends it's way around. All those turns add a little more wear to the links (compounded big time by extended/neglected oil changes).
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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.
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