Bobby Labonte(#18), Tony Stewart(#20), Sterling Marlin(#40), Joe Nemechek(#40) and Kenny Wallace(#55) tested at Las Vegas Motor Speedway last week. Nemechek posted the fastest unofficial lap speed of 166.02 mph in his BellSouth Chevrolet while Stewart was second fastest at 165.73 mph in The Home Depot Pontiac. The top qualifying speed for last year’s inaugural Las Vegas 400 was 168.224 mph, set by pole sitter Dale Jarrett( Concord Monitor )
