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Quick Answer. NASCAR stock cars were previously allowed 850 to 900 horsepower; however, this amount was reduced to 725 horsepower in 2015. The lower horsepower is used with a tapered spacer, which is used in the NASCAR Nationwide series. In addition, the 2015 rules include a reduction of 6 inches on the rear spoiler, which cuts down on the downforce for drivers.
Gene Stefanyshyn, NASCARâs VP of Innovation and Racing Development, points out that the horsepower of the current spec engine has jumped from 450 to 850 over the last 30 years, while the speeds have climbed by about 30 miles per hour and the tire footprint is the same..