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People have been able to fit 3100 SFI's, 3400 SFI's, and the 3800 SC's into our J-Body's engine bay... The best bet would probably be the 3400, since it requires less fabrication than the 3800.
 

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3100 SFI's and 3400 SFI's are found in various cars, including the third-gen Grand Am's, as well as the Chevy Venture and V6 Olds Alero's.

The 3800 SC engine is only available in the third-gen Grand Prix GTP's, IIRC.
 

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Read the sticky threads at the top of this section for some good information on 3100/3400 engine swaps. There's some things you need to know about doing them before going out and getting engines. A lot of guys (Raven and Colin come to mind) who will tell you that you can't just drop in a 3400, and encourage you to build it up first to get the best results.
 
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