There was a time in automotive history when 'replacement for displacement' hadn't been invented yet. Sure, you could extract more horsepower with performance camshafts, better (and more) carburetors, ...
What's the biggest engine you can think of off the top of your head? There are certainly still some colossal motors in the automotive market, as big as Bugatti's 8-liter W16. If you're thinking ...
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