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Will an olds 3.3 engine fit in a fiero?

No, a Buick 3.3L V6 (also known as the Series I V6) will not easily fit in a Pontiac Fiero. The Fiero's engine bay is relatively small and the 3.3L is a larger engine. While some people undertake significant modifications to fit larger engines into Fieros, a direct swap is not feasible without extensive fabrication and modifications to the chassis, firewall, and possibly suspension. The challenges would far outweigh the benefits for most enthusiasts.