Any one that could help I would appreciate. I have a project im thinking bout doing. what series does the 1991 Bonneville have.

not 100% here someone could help bt i believe thats a series I? Someone should be able to tell yo definatavley here

well the reason why i am asking is i have a series II motor and i want to put it in the 1991 because my 1995 has seen better days

That would need some of the more knowledgable guys to answer.. IN 95 was the everything OBD2? If so there may be some issues putting it into an OBD1 car

yea the 1995 is OBD2

Alright sit tight hopefully someone with a little more knowledge can help you.. To reput my point i believe the 91 is a series I motor. and you will have to see about the oBD compatibility of the motor swap.

Also the guys will ask for year and trim of your bonnie If you can put it in your Siggy so that we can figre this out it will help alot thanks!

The 91 is either a C or L motor. Not series 1 or II.

It'* very possible though. Search on "Frankenbonne" you'll see what I mean.

Thanks for correcting me Bill

Im always up to be corrected! just figured i would try to give my two cents till the geniuses came in

I'm no genius.. I learned the same way you are.