Well Chuck has about 29,500 more hours than me
, but I'd like to make three small observations about shock cooling from experience.....
1 - There are engines that are not big radials that require gentle treatment, e.g. Lycoming and Continental TSIO as used on light aircraft.
2 - I had a share in a light aircraft where we were gentle with the engine and it ran well past TBO and was still in good condition when we sold it
3 - If engines are handled in a cautious manner from early in training, there is less risk of 'regression' with potentially catastrophic results later on ...... I nearly 'chopped' the throttles on a turbo engined Navajo at 10,000' when flying for the first time ... thank goodness that the instructor was alert and had strong forearm which stopped me
otherwise I hate to think of the consequences