Honestly Maxwell, I don't think it was that the older motors were underrated.... the new motors are overrated.... I guarantee if you dyno'd them, you would find them to be short their rating.
Other note is, horsepower is a function of speed. Torque is not part of that figure. The old engines were almost square bore engines. Decent size bore, and long stroke. Much more torque. Whenever looking at hp, remember that torque matters. Go to an antique engine show....HUGE motors...low horsepower, HIGH torque.
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