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.

Post some pics Chris, and we will see if we recognize it.

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.

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.

That'* fine. Sounds more and more like it is a 4.1.

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.

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.

Been awhile, personal reasons but back. Got pics to.

Well never mind about pics, not letting me upload. Site keeps giving me error.