motor swap questions

I own a 1990 Buick Century with a 3300 V6 and OD tranny, I've been wanting to swap the engine in it for a 3800 and now I finally found a 1990 Pontiac Bonneville with a 3800 V6 and OD tranny, but the body is trashed on the pontiac ssssssoooooooo I was wondering if anyone could attempt to inform me on the amount of hell I am going to have outta this swap, and how much power should I expect outta it. They are both MPFI and the pontiac will crank up and run easier than my buick so I really want to do the swap. If anyone on here might have some info or has done a swap like this, please let me know what all wiring I will have to interchange and what all wiring can stay.

Thanks for you time!

The two will swap with some parts purchases; things like fuel lines, vacuum lines, nuts and bolts, motor mounts, etc. You'll of course need some other parts but I've never done the swap so I don't know.

You'll get a few more HP and a little more torque, but I think the real benefit of the 3800 is the parts availability for performance use if you don't have smog. Just swapping a used 3300 for a used 3800 might not be worth the headache for 15 hp or whatever the difference is.

Now if you plan on adding the supercharger to the 3800, that's a different story :)

Do search; there have been several threads on this topic.

I was considering rebuilding the 3800 before I put it into my buick, I was also going to put a L67 intake and supercharger on it along with a few other things. I know the actual swap won't be too hard but the wiring is what I'm most worried about.

I think it shouldn't be too difficult if you get the PCM and wiring harness with the 3800. The plugs that the car has to offer are probably different than the plugs on the engine, but I think you'll find they're pretty easy to research. GM is pretty universal; like if your coolant temp sensor's plug doesn't match the wire coming from the car end, chances are its just a vendor difference but the sensor itself has the same parameters. Buying a CTS from a different application would most likely get you the right connector and the same "guts" to make the swap easier. You could also just hit a junkyard and cut off the proper connector from the donor car and splice them on to your car's wiring.

If you take the time to really meticulously pull all the wiring out of the donor car, it might be downright simple. Most of GMs cars have three branches on their wiring harnesses; one for the front chassis electrical like headlights and horn, one for the rear chassis electrical, and one almost entirely separate that has all the engine/ecm wiring. The engine harness does tie into the car's chassis harness for things like power, diagnostics, and gauges, but if you have wiring diagrams for both cars, chances are you'll end up splicing the green wire into the green wire :)

It depends on how much time you have, too. I usually budget in TONS of time for swaps like this so I can take it on sensor at a time and research it, but I would bet if you looked hard enough, someone on the web has some detailed info on the swap.

l67swap.com you'll find what you need to know there and if you don't then you can ask someone on the forums and probably someon ecan give you a complete run down on what you need to put into it.