Detroit 60 misfire need help

[Mr Hagg]

With the # being lower on the cut out test I would run it several times and if it is lower than baseline each time Id pull injector and check it out maybe looking at bad injector for sure. Or the old fashion way let it cool down all the way start it up and place hand on manifold to see if #6 is colder than the rest. Inspec the orings really good if they look bad replace all of them...