Thanks for the suggestions guys.
The engine was rebuilt about 10 years ago but I don't know the mileage or exactly what was done. I assume the chains where replaced then. They look like they have more room for the tensioner to take up slack so they are probably ok.
I assume nobody has heard of a master link failure.
The chain ramps look good too but I will replace the two accessible ones.
I also have this wear on the chain case. I was thinking of changing the number of spacers on the cam but wouldn't that cause sprocket alignment problems?
