1974 Daytona 500
As a result , the 1974 Daytona 500 , won by Richard Petty ( his second straight , making him the first driver ever to do it ) , was shortened to 180 laps ( 450 miles ) , as symbolically , the race "started" on Lap 21 and the race is often known as the Daytona 450 . 
<triplet> 1974 Daytona 500 <subj> Richard Petty <obj> winner