Would someone tell me what parts from my 3100 will fit on a 3400? I have a 1997 Monte Carlo with a blown engine. I have heard that a 3400 will drop in with no modifications or very few. I have a 1997 Monte Carlo 3400 with 65k miles on it. Of course it has no starter, alternator, power steering pump or a/c. Can I use the ones off my 3100 engine?

While I have the engine out and easy access, what would be the recommended items to replace, obviously plugs and the intake manifold gaskets, timing belt, anything else.

Any guidance would be appreciated.

Thanks.
Pat

 

Pat,

welcome to MCF.com. If I can get an e-mail address, I have a PDF "how to guide" from the Grand Am guys on swapping a 3100 for a 3400 (99% is the same as what you will be working with).

Knowing the 3100 and 3400 as I do, I don't think there should be any issue fitting the alt, PS pump or A/C compressor (the MOST you might end up doing is swapping some brackets between your old 3100 and the new 3400).

Since you have the 3400 out of the car, if you are out for the "long haul" with this car (meaning, you want to keep her running as long as possible, minimal problems), here's what I would while the engine is out:
- Clean it as much as possible, degrease everything.
- Change the timing chain cover gasket
- Change head gaskets, check heads to ensure they are not warped/damaged
- Change LIM gaskets (use the Fel-Pro aluminum ones, DO NOT get the crap nylon gaskets).
- Consider changing the oil pan gasket.
- While the heads are off, clean/degrease everything you can. Soak rockers and push rods in a degreasing agents to "de-gunk them". Make SURE you don't mix the order of the push rods (there are at LEAST 2 different lengths).
- New plugs (I'd recommend AC Delco or NGK, go platinum or irridium, NGK plats have worked great for me).
- Clean the throttle body, IAC, LIM and UIM. There is a passage on the UIM that goes to the EGR, clean the gunk out of that.

Beyond all that, read this:
https://montecarloforum.com/forum/ge...0-miles-46078/

Best of luck and share details of this project. A 3400 swap is a great/cheap/easy way to beef performance on a 3100 powered Monte!!

 

Thanks for the prompt reply. My email address is patwoodruff@charter.net

 

OK, just e-mailed you the PDF. Hope it helps.

 

What year and model is the 3.4 out of, trust me that makes a difference

 

1997 monte carlo

 

1997 Monte with a 3.4.... I have a feeling you're talking the 3.4 DOHC engine that's known as the LQ1.

As far as I know, no 5th Gen Monte Carlo or 2nd Gen Lumina had a 3400 (LA1) engine.

Anyways, if you're serious about swapping an LQ1 in, know that its' not an upgraded 3.1 where you can swap the accessories and be plug and play. The main thing that comes to mind is that the Alternator is all the way at the bottom and the power steering pump is unique to that car (or I may just be thinking about the 1st set of W bodies)

To be 100% sure, on the top of the donor engine, what does it say? "3.4" DOHC V-6" or just "3400". Because as far as I know, the 3400 didn't show up in anything but the GM minivans until the Grand Am and Alero came out in 1999. The Monte Carlo didn't get a 3400 until the redesign in 2000.

 

I meant what year and model is the 3400 coming from

 

His original post says that he has a 97 MC with a "3400" that he wants to put in his 3100 Monte Carlo. That's why I asked him if he's sure it's the actual 3400 and not the 3.4 DOHC I have.

 

Good call, didnt even notice that