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i have seen a 86 with a 454bb 5 speed. not factory

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16y ago
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6mo ago

The largest engine offered in a Pontiac Firebird was the 455 cubic inch (7.5L) V8 engine, which was available in the Firebird from 1971 to 1976. This big block engine produced up to 335 horsepower and was known for its potent performance.

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Q: What is the biggest engine for a firebird?
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