well...it looks like I'm back finally! I'm going to start another Jeep CJ or Wrangler project in the next few months and hve been looking at GM's Displacement on Demand 5.7l engines.

Has anyone tried to swap this into their rig? What did you think?

I think they work the opposite of your post.. I think they take OUT displacement on NO DEMAND.
I cannot see this feature being worth the work and risk on one of our shoeboxes.
MAN what a bunch of sensors it prolly takes to get it to work. I wonder if the tranny that came with it is needed?
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />

I wonder if that's similar to the 5.3 liter V8 engine thats in my 2007 Trailblazer and in some Chevy pickups. When there is no large demand for power, the computer automatically shuts off four cyinders (randomly rotating them), them brings them on line again when the demand is there.
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It's a pretty seamless operation and the full power is over 300 hp, but it takes a hell of a lot of sensors, computer work, and wiring to make it work. I certainly wouldn't want to try to put one of them in a CJ or Wrangler.

Hmmm...didn't think it would be that labor intensive if someone had a kit. I remember people telling me that doing a 4.0 swap was too complex and had all these issues. Hell, after I put the motor in, it took about 3 hours and it was running...never a problem for me.

What would you recommend instead? Just a regular ol' 350? I don't wanna spend tons of cash on gas so I was thinkin of going with a V6 (I'll have to drive to and from work in the snow).

I'd build a really nice tight 304 AMC. It should jump right in there and have PLENTY of torque and horsepower for that ride.
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />

my brother had a 86 cj7 that he droped a built AMC 360 in. my other brothers friend has a 72 nova with a 454 that ran 12.2 in the 1/4 mile at the time, he kept ripping on my brother about spending all this time and money on a motor in a jeep so my brother talked him into racing, i still remember the look on the kids face as we were right next to him flying down the street. not to mention the great smoke shows itd put on with them 35's. sadly he sold it before i got my license, and unforcanatly i dont have the money right now to do that to my wrangler, but its on the list, anyone here ever done or heard of someone droping a olds 455 into a jeep?

Actually, the AMC V-8's are about the easiest to swap in a CJ7. The suggestion for a AMC 304 is good. An AMC 360 is even better, and they are fairly plentiful, since they were used in a lot of the AMC cars and trucks. AMC 390 and 401 V-8's are even more power (especially the 401), but they are much rarer. All of those AMC V-8's use the same basic block, with differences in bore and stroke. Accessories, engine mount, and bolt patterns are the same for all of them. With the two larger ones, you'll want a quad carb (or FI), but a MC 2150 2-bbl works fine with the 304 or 360.