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Originally Posted by wushuhsu
You forget US muscle cars in the 60s were getting 400+ HP easy off 6L engines. But they got like 8 mpg and polluted like crazy. Cars have much smaller engines now due to emissions control regulations and fuel economy regulations. In the future, I expect to see even cleaner engines, perhaps not even gasoline. Horsepower will probably also go down too.
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Maybe but HP in the 60s (up to 1972 actually) was 'Gross' HP measured on a blueprinted engine with no mufflers, accessories etc. In addition, manufacturers usually overstated the HP to keep competetive.
For example (if my memory serves me correctly), the 454 Corvette motor in '72 was rated at 270HP. Previously it had been anywhere from 365 to 425.