The original timing chains are endless (no master link) which seems like the safest and best way to make a chain but impossible to install without major disassembly. The job is much easier if the replacement chain has a master link and they are very reliable when installed properly. An alternative to the more common U-Clip type master link however is the double e-clip solution! This uses a hardened e-clip on each link, so in theory, if one clip should somehow fail, the other one will likely remain. In actuality though, it's nearly impossible for either to fail.
These master links were standard fare on Mercedes Benz V-8s like the 450 and 500 motors for example. On those motors, the duplex chain had 198 links, drove both camshafts up top and wrapped around an idler sprocket below so it was subjected to much more vigorous use. Proven technology!
This is a chain of the highest quality with the best master link available for an easy installation with reliable performance so that you can sleep at night.
Duplex chains were used on all models up to 9/78.
Equivalent to 11 31 1 250 258 (no, better)