3.5 swap?

[2003 grand prix se]

Hey guys i have a 03 grand prix with the 3.1 and the headgaskets went out so i was going to get my motor rebuilt but i was told to just swap it out with a 3.5? Has anybody ever did this and will it just cause problems down the road? Thanks!

 

[ctracer]

itll bolt right up to the tranny and such, the wiring shouldnt be too horribly bad. youll have to tune your PCM so it performs at its best.

 

[2003 grand prix se]

Ok cool. I was just wondering if my check engine light would come on since the motor is newer and also since.computers are so sensitive now days. Think i should do it or just rebuild my 3.1

 

[Tuner-Extraordinaire]

3.5 no sir.

maybe a 3.8

 

[2003 grand prix se]

Why not a.3.5? Just wondering. And wouldnt it be quite a job to put a 3.8 in it?

 

[jteske88]

i think a 3.8 would be the easiest route and worth the hassel.

 

[ctracer]

it would be a little bit more work to swap a 3.8 in, but a 3500 swap is definitely able.

MMS 3500 swap
disregard the comments on the '96 model year.
3500 Swap Finally Underway, a few questions

a 3.8 would be more worth it.

 

[blueguy]

^^ Better than the 3100

3.5 no sir.

maybe a 3.8

Yes, 3.5.