Eventually the point is reached where you've made as much power as possible on pump gas. An engine's power potential depends on how much air it breathes and the fuel it burns. Engine modifications such as larger bores and longer strokes add displacement, which increase airflow and power. Bigger valves, CNC ported heads and a hotter camshaft with increased lift and duration also increase airflow for more power as engine rpms go up. A big CFM carburetor or multiple carbs also allow more air and fuel into the engine. Need more power? A supercharger or turbocharger can stuff even more air and fuel into an engine. Just turn up the boost pressure and you can make even more power.
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