Hey im new to the site as a member, this site has been my Monte Carlo Bible for the past few months. I have searched high and low for any straight forward info on a engine swap on a 2000 LS 3400 NA to something that can be upgraded past a simple CAI or Exhaust system For any worthwile gains in power...
First question, What would best my best bet to swap with?

L36 3800 series II non- sc
L67 3800 series II supercharged
L26 3800 series III non- sc
L32 3800 Series III supercharged
Lz9 3900
LS4 5.3L V8 FWD (in new MCs, Impalas, and GPs)

Would there be any Engine mounting issues? I believe the 3400 and the 3800 mount the same way for '00-'05...

Would i have to do any initial upgrades as far as engine components... Starter, alt, ect. I could fine no infor to campare my engines performance stats to such as alternator output ect...

PCM... All new im expecting...?

General guess as to how much needs to be relocated? Brake lines, fuel lines, wiring harness diferences?

Any potential issues im overlooking?

I have been workin on cars my whole life so i believe i posess the skills to do the labor my self, but i have only worked on Classic muscle cars... no electronics, no computers, no a/c, but a huge *** engine.

Any help is good help,

I would really LOVE to have a V8 in it, will it fit??? 5.7L...

 

I would say the L32 series III S/C with trans and PCM/wire harness, as well as the donor car's axles. The S/C handles heat better than the L67 S/C, it has more horses than the L67 and offers better fuel economy than the V8. I don't think the car's break and fuel lines need to be relocated with the L32, Idk about the V8 but you shouldn't have to do many things to make it fit. If you get an L32 get the whole engine/trans/PCM/Harness/Axles, and then have someone who knows about tuning, tune the car for maximum gains.

Idk about the 5.7! I've never heard of one swapped into these cars.

 

If you are really serious about it, hell try for the LS4, I wanted to for a while but then I realized it doesnt have alot of mods to be done besides a turbo, and those arent cheap. My next choice would be an l32 series 3, the superchargers are awesome and they are very potent motors.

 

didn't we just have a member join not that long ago thats doing a ls4 swap into a 6th gen...

 

Just bumpes his new member thread screen name Dredd

 

if you want to do a v8 it would probably be easier and more cost effective to buy one with it in it already. there fairly priced now.

 

The L67 would be the best power for money one.

 

L67 is the best for the swap for sure...It can be found easier than the L32, and more mod's are available, over all it will be cheaper.

 

I have an L67 swap post sticky'd in one of these forums, the info should be 99% the same for you coming from a 3400. The only main difference will be which wiring harness you use (you'd use the same year as your car with a 3800) and you wouldn't have to make custom axles.


First question, What would best my best bet to swap with?

As said above, L67 is the cheapest out of all of them- best bang for the buck. The LS4 is probably the worst option since it will be the hardest, and most expensive. Really though, if you're considering an L36, L67, LZ9, or LS4 - you should probably first ask yourself why you want to swap instead of just switching cars completely- that would be a whole lot easier, and you'd end up with a factory reliable car. The reason so many swap L67's into 5th gens is because they never came with it.

No issues.

None of this matters- you buy a complete powertrain (all accys, trans, etc) and drop it all in.

Use the one from the donor car- hence why its a good idea to get the trans too, so you don't have to have one custom programmed.

Nothing should need to be relocated. The wiring harness will need to be completely swapped to a 6th gen monte that came with the engine you're swapping in. Depending what setup you go with- this could be a 100% plug and play swap.


You could do the LS4, thats a 5.3L- and if you specifically wanted it to be a 5.7 for some reason, you could always overbore it I'd imagine. Any particular reason you'd want a 5.7? For reference, GM did put an LS1 into a newer impala, that was probably the basis for the LS4 which is virtually the same setup with minor tweaks.

 

OK. Tons of great info,

The reason for the swap: 3.4L nothing can really be done with it, and i have alot invented in the rest of the car... not worth a new one.

L32 vs L67 im hearing its more of an personal opinion, would i be correct?

but the L67 seems cheaper and easier to find...

Preference.

Im seeing about 3K for the L67 engine at Milzymotorsports.
and im not finding many places with the L32...