Horsepower out = Amps In times Volts in divided by 746 multiplied by efficiency. The efficiency of motors that size is typically 60% and the input voltage 120V. Thus HP out = Amps x 0.0965. For the 14A Sears that's 1.35HP and the 15A PC is 1.45HP. The "Peak Horsepower" or "Developed Horsepower" is marketing puffery supported only by trick measurements and misleading definitions. Look at the current draw and ignore the HP numbers.