I have been getting some help in the garage from my 3 year old assistant. Samuel did a fine job of measuring the muffler off the YC Stover: http://www.oldengine.org/members/pml/samuel/2014-08-23_measuring.jpg Patrick M Livingstone 0418 692013 Earlwood NSW http://www.oldengine.org/members/pml/Index.html