I know that this will probably be really one sided but which of these engines is honestly better: The Ford 4.9L I-6 of the Jeep 4.0L I-6. I would personally think that the ford id better but i'm not sure so thats why i'm asking. What are the advantages/disadvantages of both.

 

Go with the 4.9, better in every way, WAY more power, more torque, and about the same gas mileage, 4.0's are pieces of crap

 

Having worked on both and run both, I can honestly say that, first of all, both are very strong and reliable engines. In stock form, the Ford is biased for a stronger low to mid range torque curve than the jeep. The Ford will pull a house off it's foundation, but won't wind out very high. It actually runs like a diesel, given it's limited RPM range. The Jeep engine however, while strong down low, is actually tuned for mid to upper RPM performace and horsepower, and it behaves more like a little V8. I think they are both grat engines. For a heavy truck or for heavy pulling, go with the 300 (4.9L) Ford. For a lighter truck or light/occasional towing, go with the 4.0L Jeep. Alot of guys here will propably crucify me for saying it, but GM's new Vortec 4200 Inline Six is a hot little number too, and would be a cool implant into an older car or truck being upgraded to EFI and such. I have little experience with that engine however, so I can not vouch for it's durability in any way, but since it is an inline six, it's guaranteed to spank the old GM Vortec v6 eight ways from sunday.

Dave

 

Both are very good engines, I've driven both for a long time, I personally like the 4.9L, aside from the very short powerband.. Both great engines.

 

Both the 4.0L and 4.9L are quite good for what rigs they equipped-the 4.0L wasn't a factory low-end torquer, but I bet the 4.7L stroker kit that Clifford has for them would make those mother's scream.

The 4.9L...well, I wish Ford didn't cheap out/ditch it and was able to make an OHC version and at least make it the base engine for the F-250 if they couldn't cram it into the newer F-150.

Anyway, to the point, the 4200 won't be going into any cars or anything period other than the TrailBlazer clones, unless someone makes a kit to erase the differential from the oil pan. Even 2wd version have the hole filled in and that still makes for a very tall engine. Not something you want in a car, in that resspect, but the TB clones are tall-roofed stations wagons anyway. Now, the 3.5L I5 doesn't have that hassle......