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How hot would the head need to get before the valve springs were damaged tho? they have a constant flow of oil going over them.
Of course you can get nice little 1/16" thermocuples who's leads would squish in to the valve cover gasket if you wanted to get a reading on how hot they really are getting, otherwise a $15 remote kitchen thermometer would work too, for about $30 you can get one with a wireless readout that you could put in the car and just stick the probe inside of the valve cover next to a valve spring, wired in place of course.
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