I have just overhualed two C-85's with the O-200 crank STC and I have to report that they are very strong. When doing the run in I found them to have a lot more thrust than regular C-85's. They seemed to be more reponsive too.
A&P IA. Holder of STC for O-200A's in 120, 140 & 140A's. Engine overhauls on C-85's ,C-85's with O-200 crankshaft, C-90's and O-200A's
State Rep for California