Pro Modifieds, the colorful drag racing class with few rules and big engines, has worked its way from an IHRA beginning 20 years ago to NHRA professional status.
Rules are simple compared to other pro classes. Engines can be 527 cubic inches, supercharged (blown), and methanol fueled, or have a larger 820 cubic inch engine fueled by nitrous oxide and gasoline. Typical horsepower is above 2500.
Cars can weigh 2700 lbs (supercharged) or 2375 lbs (nitrous) and have a hood scoop for the nitrous cars or cut hood to accommodate a supercharger fitted onto a blown motor.
Identifying a supercharged car from a nitrous car requires hood observation. Superchargers stick out of a hole in the hood and nitrous engines have large hood scoops.
Watching wild designs on modified classic cars is a big part of the Pro Mod draw. Popularity follows an entertaining form of color and power on straight race tracks.
This slide show should support that attraction, with images by Gary Larsen at Racetake.com.