Thanks for your efforts but I've found a reference to Dale Earnhardt winning the Busch Clash at Daytona on 10 February 1991 at an average speed of 189.474 MPH. So the question still stands - what was the fastest NASCAR race ever? What I'm really trying to establish is what was the fastest closed course race ever held and I suspect that it was a NASCAR event. It would be neat if the title of Fastest Ever Race Winner belonged to Dale Earnhardt.
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