I won't break an engine in any other way, I don't even heat cycle them. Get it warm and then hard acceleration/deceleration over and over and over and over again. Never had any problems with gaskets so I think heat cycling just wastes valuable hone scratches, once the sharp edge of the scratches are gone, you aren't going to do any further seating your rings.
Worst that's going to happen when you skip heat cycling is you would have to replace a gasket.
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