Lots of good information above to read and follow. Assuming you had a 15 lb. radiator cap, and you reported no fluid loss or belching of coolant into a overflow tank, the cooling system did not reach 300 degrees F.. Here is why. Maximum boil protection with antifreeze is 226 degrees F. You add 3 degrees per lb of radiator pressure held. 15 lbs. equals 45 degrees. So you will begin belching fluid out of the radiator at 272 degrees F. If you were losing no fluid, you were likely in the 250-260 degree zone. That's plenty hot but probably not fatal to the engine. As mentioned, some damage probably happened, but it hopefully is very minor and not noticed. Small leaks of oil and/or water will be the most likely noticed items. Hope it's OK.
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