JEFF B - Don't let the carbon deposits on the head, piston top & valves bother you. Other than it looks like the head gasket leaked a L-O-T, it really doesn't look that bad. Try to get as much of that oil & crude off the cylinder fins as possible. Oil is a great insulator.
If you read & study the notes & comments in the University of Nebraska Tractor Test reports, decades ago when lots of ag tractors had flat-head or also called side-valve engines it was actually common for the tests to be stopped and the carbon deposits removed to restore performance during the short 45-50 hours of running during the tests.
Another wise comment I read years ago, modified slightly to fit the subject of K-series Kohlers, "There's only a few grams of metal difference between a new engine and a totally worn out one. The important thing is where those grams of metal come from."
If you read & study the notes & comments in the University of Nebraska Tractor Test reports, decades ago when lots of ag tractors had flat-head or also called side-valve engines it was actually common for the tests to be stopped and the carbon deposits removed to restore performance during the short 45-50 hours of running during the tests.
Another wise comment I read years ago, modified slightly to fit the subject of K-series Kohlers, "There's only a few grams of metal difference between a new engine and a totally worn out one. The important thing is where those grams of metal come from."