6 liter? Oh my sweet summer child…my mom’s car was something north of that and made (officially) 325 hp. Nobody cared much when gas was 25 cents a gallon.
The real answer is market dominance – there wasn’t much incentive for change beyond style and marketing efforts propping up the juggernauts of “the big three”. The cars of the 60s were essentially cars of the 40s layered with a lot of marketing and a smattering of technical improvements.
Emissions and safety regulation, fuel price apocalypses, and losing their markets to foreign competition that had leapt ahead in efficiency and quality finally lit a fire under them but it took a very long time to do it.
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