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The only difference between shutting the car down in your garage and running it for EOC purposes. . .
Is the EOC requires it to start going again and suddenly.
You can also notice this on some cars that the pumps are synced to the rpm. going over I-26 in august from Erwin to Asheville My engine gets really hott climbing because its well over a thousand feet in about a mile and it does this 2-3 times. If I push the clutch in at the top of the mountain and coast down engine temps actually increase because the pump slows down and doesn't cool the block.
The danger is thermal elastic deformation. Thermal deformation is much more powerful than strain deformation. The coolant won't likely suffer much of a problem but the engine is no longer transferring heat away. In EOC you aren't running more heat like I do in coasting(they ticket almost everyone speeding for speeding and driving in neutral), but still for the initial few seconds when the engine starts back up the temps are going to soar and your temp gauges won't notice because the super heated fluid is mixing and cooling.
In the summer you don't really need the grill block, but even if your pistons and cylinders expand 1/1000 of an inch each that cylinder needs a sleeve and the piston needs to turned(100 + 50 bucks).
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