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What is the largest street legal engine in America?

There isn't a single definitive answer to the question of the "largest" street-legal engine in America. "Largest" can refer to displacement (cubic inches or liters), overall physical size, or even weight. Also, the definition of "street legal" can vary by state and even depend on specific modifications and the interpretation of local regulations.

While some manufacturers produce exceptionally large engines (like some custom-built V8s or even some modified diesel engines), there's no official registry or certification body tracking the absolute largest. Many extremely large engines are built for specific applications (like monster trucks) and might not be easily or legally road-registered.

Therefore, identifying the single "largest" is impossible without very specific and possibly subjective criteria.