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Yes, but!!!!!!! You will also need to replace the: transmission, drive shaft, replace/regear the rear differential, ECM, exhaust, probably the motor mounts/locations on the front crossmember/engine cradle, front springs (v6 not strong enough), front shocks? (check part #'s)...I am sure that is not all. It is certainly MUCH more advantageous to sell and buy a v8 model. The only way this would be useful is if you had a donor car with all of these items and you were planning on putting a really beefed up engine in or something and putting in custom components anyhow.

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15y ago
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Q: Can you replace a v6 to a v8 in a Pontiac firebird?
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