Been building engines for alot of years for both myself and customers and have never retorqed the head bolts "like the book says" for the very reasons you state. The engineer that came up with that train of thought obviously never had to spend several hours removing all the other parts in the way to do the retorque once the engine was installed in the machine, or he'd have thought twice about it....
That said, I typically do them just like you say you did and retorque them after test running the engine on the stand long enough to get it good and hot. Like I said origionally, I've been doing it this way for alot of years, on quite a few brands, and have never had one come back or have any problems.
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