I did it on a flight Monday with the O-320 H2AD in our 172 N. It's been
discovered in the past few months that using carb heat improves the mixture
distribution, probably by the heat increasing vaporization. Not all engines
will do it and there may even be individual variation among the same models
in the same airframes.

Without matched injectors and an engine monitor, you can't be sure one or
more of the cylinders haven't gone over to the high stress region just ROP
so it's probably a good idea to limit LOP operation to 60% power. My engine
was just a hair rough but I saw the CHT go down 25 degrees. It was
roughness you would have to listen carefully for, not something that would
be annoying.

I did a lot of fiddling to be sure that I really was LOP and watching of
gauges. Now that I know what to listen and look for, I think it will be a
lot easier.
--
Roger Long