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Old 11-19-2009, 12:34 PM   #1
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Question Engine Size?

I currently have a 1982 Bonneville with what I thought was a 4.1L V6. The man that sold it to me even said it had the 4.1L in it, so a friend decoded the VIN an it plainly says when it was built it had a 4.1L in it. I'm currently changing oil pan gasket an I found the engine stamp. It says 3.8L. Is it possible that the 4.1L was swapped? I'm the third owner too by the way.
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Old 11-19-2009, 12:43 PM   #2
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Post some pics Chris, and we will see if we recognize it.
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Old 11-19-2009, 12:51 PM   #3
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I looked in Alldata to see about your question. If you have a 4 bbl carb and everything is stock this should be a 4.1. The only way a 3.8 had a 4bbl from the factory was with a turbo. Is your car turbocharged? Does the car look like it has had an engine swap? I can't confirm this but I think a 4.1 is simply a 3.8 block bored out from 3.800 inches to 3.965 inches.
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Old 11-19-2009, 02:04 PM   #4
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Can't post pics till either late tonight or first thing in the morning, wife is at work with camera. It'* not turbo charged, I can say that. I'll have pics later.
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Old 11-19-2009, 02:06 PM   #5
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That'* fine. Sounds more and more like it is a 4.1.
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Old 11-19-2009, 09:14 PM   #6
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Not if it carries the 3.8 stamp. Turbo delete? Manifold/carb swap? Special order? Indeedly a strange one. GM was running out of engines for whatever reason in that time period and did some queer things. I remember Oldsmobile was sued for putting Chevy and Pontiac engines in their models without disclosing the fact.
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Old 11-19-2009, 09:53 PM   #7
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Not if it carries the 3.8 stamp. Turbo delete? Manifold/carb swap? Special order? Indeedly a strange one. GM was running out of engines for whatever reason in that time period and did some queer things. I remember Oldsmobile was sued for putting Chevy and Pontiac engines in their models without disclosing the fact.
He PM'd me his VIN and the 8th digit is a 4. That means he has a 4.1.
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Old 11-19-2009, 10:59 PM   #8
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Yep. Well I went a digging and low and behold. The "Brougham" trim level got the 4.1L.
Which Buick made by boring out a 3.8 to 3.965 inches.

Talk about "Stump the Forum" Your a first here Doggz with a "unique to us" Bonneville.
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Old 12-03-2009, 12:38 PM   #9
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Been awhile, personal reasons but back. Got pics to.
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Old 12-03-2009, 02:06 PM   #10
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Well never mind about pics, not letting me upload. Site keeps giving me error.
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