Two donkeys:
I know you did not mean that you abuse engines...
I just didnt want it to look bad for you.
By the way just another note on this subject, in the engine manual from Wright for the R1820 they are very clear that power reductions be made slowly to prevent cylinder choking resulting in ring flex damage and piston scuffing. and caution you should exercise care in maintaining cyl temp and avoid rapid cyl. head temp. fluctuations.
Proper care of any engine is manditory, and thermal shock does damage engines....period...
Chuck