American Motors rated the car at 340 hp (250 kW), but the National Hot Rod Association (NHRA) rated it at 420 horsepower (310 kW) and shuffled it among various competition classes that included SS/G and SS/D. The Super Stock AMXs were also put in SS/E class by NHRA on the basis of the car's 3,050 lb (1,383 kg) weight and estimated 405 hp (302 kW) and ultimately slotted into the SS/C class.[63]