Not! I never knew the 5.0's fluctuate so much. On my old Plymouth with the 440, it's pretty common. Cold start goes up to 80, and stays there until it is fully up to operating temp (180). Then it will go down to 30-35 at idle, and up to 55-60 on the highway. Used to bug the crap out of me, until I found it that's normal for those engines.
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