Pontiac Firebird
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What's is the biggest engine you can fit into a 2000 Pontiac Firebird 3.8 just doesn't cut it?



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A 350 will easily fit but you could install a larger engine with major modifications. Stick with a 350 which was the optional engine in Firebirds. You will have to change the ECU also, so a donor car would be the easiest. If I were in your shoes, I would sell this Firebird and purchase one with a 350 already installed. You would be money ahead in the long run.