Well i just found this thread and thought id chime in being im new but i have used the the fourm for a couple of days now. I own two 8th gen bonneville's one being a 89 LE that my family has owned since new and its my baby. Now on to my new addition my 90 LE i picked up for a little of nothing but ...

Hmm thats bummer i was really hoping that i could have used the heads so now im at a cross roads does anyone know of a build thread for a SII swap in a older 87- 91bonneville that I could follow? And thanks for the help guys im just stuck because there same motor 3800 231c.i. Motor but they don't ...

I understand it not that easy but given i was just wondering couldnt i just swap heads from the sII to the LN3 i have or is that impossible im just trying to cut a corner. Quickest rout would be? Does anything swap over from sII to SI? I am trying to build my car quick as possible

Don't sound hard but a big hassle but me and my father got to talking we think we could swap the heads and use the LN3 with series II heads. Would we just be able to do that? Given I need my car fast because my 85 el Camino is going under time to rebuild the motor in it and thanks for the info matt ...

I wish to know more about the motor swap if it would or would was a difficult swap? And id love to see and hear more about your build as i own two bonnevilles 89 & 90 both LE's but im planing on having fun with my 90 but sweet idea i just wanna know whats the progress on it

I have a 89 & 90 model bonnie but one of which the motor is gone and i have a free 97 old delta 88 that was just given but i was wondering if anyone of you guys could answer some questions? Could i just dumb the series II down to series I ie change the intake and sensors or would i have to use the ...

So basically i cant swap the intake and use the motor and odds and ends id just have to swap the whole motor and ecu? And if i do just swap the motor would the trans bolt up to the block 440t4 trans i think thanks for the help so far man im just trying to see if there is any possible way i could use ...

I have a 1990 bonneville that i and trying to build but the head gaskets are blown and i was just given a 1997 olds 88 with a series II engine with the top end just being rebuilt. i was wondering what would i have to do to make the engine work in the older car or would it just be better to pull the ...