At some point, I want to do a small block swap in my YJ. It currently has a rebuilt 2.5l. It wont let me upload pics from my phone or I would post rebuild pics. I would prefer to go fuel injected, but open for other options.
Just sold a cj with an lt1. Only kept it for 2 months after the swap. I just didn't like it. Felt wrong MPG sucked and had to spend more time and cash on fuel cell. The stock tank and lines were no where near good enough.
I would suggest an inline 6. Either the 4.2 or 4.0. The 4.0 would be great with efi and stroke it.
If its speed you want then you could hear it better. Just a thought
Correct me if I am wrong, but I thought maybe the mpg wouldnt change much. This is why, the 4cyl has to work harder and only gets like 17 mpg. So, I figure, not having to work as hard, the mpg for the small block wouldnt be much different, if not a little better. The mpg really isnt too big of a deal, because the furthest we drive it is about an hour away and thats only to go the river. Id be totally fine with an inline 6. I would just have to find one cheap.
Just figure that everything you do to a Jeep will make the mileage worse. Get past that crap and stick with the desire to get more power. I went with a 4.3V6 from a 2.5L, and with the 4.88 gears I've never had power issues on or off road.
Lots of Google info and threads on swaps. You first need to decide Carb or efi. Efi is the best way to go then you'll want the 4.0.
You'll need the engine harness or make one, the ecu, sensors.
If you go automatic Tranny you'll need the linkage and tcu.
Ok, so carb would be easiest, but I think I would just rather have efi. It cuts down on having fuel issues IMO. I assume the 4.0 would be the route then. So, the next question is and might be a dumb one, but would I need the tranny/t case for the 4.0 as well or would mine work?