The Michigan engine testing was the first major chassis-dyno test of the season. #2-Kurt Busch's car weighed in with 839 horsepower at the rear wheels, best of Sunday.
Now the rule of thumb is that numbers from a chassis-dyno run are about seven percent lower than actual engine horsepower (because the chassis dyno measures output after the horsepower runs through the entire drivetrain). That would mean Busch's true engine horsepower would be nearly 900 horsepower.
Other key Sunday chassis dyno results (unofficial since NASCAR doesn't publicly release the figures, despite a push by several top crew chiefs for NASCAR to release the numbers):
#31-Jeff Burton (11th at Michigan), 830 horsepower.
#8-Mark Martin (sixth), 827 horsepower.
#18-Kyle Busch (race runner-up) 825 horsepower.
#99-Carl Edwards (race winner) 819 horsepower.
#48-Jimmie Johnson (17th), 819 horsepower.
#83-Brian Vickers (seventh), 818 horsepower.
That's a range of 21 horsepower.
All these stats are from
Jayski.com Horsepower numbers. 
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