Go to
http://www.stovebolt.com/ubbthreads/...s.php?ubb=cfrm
in the Forum look for shop area then under engine....first post on engine ID....
The last link on Advance ......
The prefix MR does not appear any where...... but there are exceptions.
In any event it is a great acquisition and probably belongs in a cab 11 .......
Cheers