add a supercharger to a non supercharged 3800 ? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-13-2014, 10:27 PM   #11
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Default 3.8 to 3.1 swap. is it possible?

I know that this is not something that is done usually. but I have a good running 3.1l in a smashed 2000 gran prix. and a 1999 gran prix with a locked up 3.8l will the 3.1 bolt in without a lot of hassel? I know that I'll have to swap the computer, but what else?
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Old 05-14-2014, 05:46 AM   #12
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I'm seeing issues with a computer swap when it comes to years like that. Probably more headache than it is to find another 3800. 3800'* do kinda grow on palm trees these days. As far as the engine fitting, I have no idea. Another question is, was it the same kind of transmission also?
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Old 05-14-2014, 08:00 AM   #13
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i think 3.8s have the 90degree bolt patten and the 3.1s have the 60

as mike said though 3.8s run forever so there are a ton of good engines in cars with rusted out bodies in the yards
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