I don't know NHRA rules for today, but when I was active in the '60s, weight breaks did not include the driver. In a small digger or altered, the driver can contribute an extra 10% in weight, which throws off computation of horsepower by just using the class weight break for the computation. Another aspect in calculating power is that not all cars can make the min. weight break, but fall into the class anyway.
In 1965, my Chevelle 300DX 2dr sedan with a 350hp 327 fell into the bottom of the A Stock class. A/Stock was the home of the Mopar 426, 427 Fords including the '66 Fairlane, and 427 Chevy Biscaynes. I was not allowed to add ballast to make B/Stock so I taught my wife to run it. The 70 lbs difference made for nearly a tenth, and many sorry looking faces after getting beat by a "girl". Anyway, if one is to calculate power from performance #s, you need to know the actual weight of the car and driver.
