Thread: 5.7 Engine swap..

So i am wondering, if you can put a 5.3 in a 1997-2003 grand prix.. Can you put an aluminum block 5.7 in there??? I would imagine you could use the 5.3 transmission, wire harness, possible computer too??? but not sure anyone have any ideas or thoughts?? I just love the way V8's sound compared to anything else.

i dont see why not, computer for the 5.3 wont work though, are you thinking LS2?

the bellhousing should be the same, I dont see any issues but the computer.

ls2? Why wouldnt the computer work? Couldnt you just tune it for more gas? i am really considering seeing if it works, and a supercharger too lol. It would be pretty sick!!

I thought about doing the LS4 in mine but that would be too much of a pain in the butt when it comes to the pcm. That would make one hell of a sleeper though.

well being that the grand prix is a front wheel drive vehicle and the LS2 is predominantly rear wheel, good luck with that. There is a guy over on LS1tech who is swapping in an LS2, IIRC, into a 308 and I believe he was creating a custom bell housing in order to use the 4T65. Not much progress has come along since last year tho.

Like GTP 98 said tho, your best bet would be to do an LS4 swap, especially being that the 05-08 Grand Prix had them as an option.

the 5.7 and 5.3 dimensions on the block are the same. the bellhousing bolt pattern should be the same with all of their 90 degree small blocks


you can prolly tune the ls4 cpu to work with the 5.7. but in missouri there is a late model junk yard, mainly sports cars, over 500 ls motors at at that place. He sells the engines, harness and cpu together.

^^prolly a 302 bored .30 over.

lol, yes, as in ferrari 308. I just found it again...

EPP Ferrari 308 LS2 project car! - LS1TECH

Here is the swap that I found the made me want a v-8 in mine. Check it out!

Tom K of Texas is the proud owne