What is the samllest V8 engine that wasnt made by a hobbyist?

Q: I have seen tiny V8s with like 1 inch bores and stuff but whats that smallest one that in production? like something used in a car or for racing?

A: formula one currently runs a 2.4L V8 from Wikipedia: "For a decade F1 cars had run with 3.0 litre naturally-aspirated V10 engines, but in an attempt to slow the cars down, the FIA mandated that as of the 2006 season the cars must be powered by 2.4 litre naturally-aspirated engines in the V8 configuration that have no more than four valves per cylinder..."

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