After doing numerous little things to my 4.0L I have decided that it is time to stop playing with an engine that was never intended to be a performance engine and swap something else in with a few more cylinders and a lot more potential. I am really interested in swapping in a newer modular Ford V8, but haven't been able to find any info on a swap. I know I can get an adapter to bolt a 5.0L to my AX15, but I think the 4.6L would be a more efficient motor and is probably lighter as well. Of course, the 4.6L Jeep stroker is another option, but as odd as it sounds I think the V8 would get better mileage due to A) it not having to work as hard and B) it being a newer more efficient engine. I am currently running 4.56 gears with 35" BFG All Terrains and the 4.0L has a header, full exhaust, TB spacer, MSD 6AL, Super Conductor wires and Blaster 3 coil and Bosch Platinum +4's.
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JMO, but I'll let you in on a little secret. The Jeep itself was never intended to be a performance vehicle either, let alone the 4.0.
With your 35's - why not just go 4.88 or 5.13s and call it a day. Take the extra money you saved on the swap and you can pick up a nice Mustang to beat on the track with.
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One advantage of the older Mustang 5.0 engine swap is that it is flat out easy. I don't think you have any emissions inspection issues in TN, so the older (pre-92) engine shouldn't cause you any trouble. I LOVE injected 302s, but quite frankly they aren't that strong of an engine. They are light, easy to cool, and have a world of aftermarket support. With a pair of shorty headers and some Flowmaster mufflers a Mustang 5.0 is one of the sexiest sounding stock engines of all time.
The 4.6 Fords are less commonly swapped than the Gen III GM stuff nowadays so there is a bit less aftermarket support for it. I believe the overall width of the modular Ford engines make them less attractive. If you need an OBDII era EFI, I would look at GM instead of Ford. (I can't believe I just said that, ugh, Garbage Motors......)
I wouldn't count out a stroker Jeep inline 6. The overall cost start to finish would probably be less, all your accessories and gauges will work, and the HP/TQ numbers are definitely in the small V8 category. Add in the "stealth factor" and it seems like a good choice.
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I considered a motor swap,kept it stealth with a stroker in case emissions or registration play a part one day.
I'd look for a alum block GM 6.0L light duty truck motor from a wrecker, cheap and plentiful. With headers, intake, exhaust, 340 flywheel and over 400lbs torque would be reasonable, and thanks to advance adapters it will bolt in with some of their parts list.
One day I'll do an auto tranny and a big block, a Brute kit, but not yet. Can't do everything at once..........
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You're biggest issue with going with the 4.6 V-8 is the width of the motor. With DOHC's that sucker has a wide and large cylinder head assembly, which might not clear the inner fender's of your Jeep.
Also, you are wanting more power, and let's face it, Ford has never really been able to get any decent numbers out of the 4.6 unless they've put a blower on it. Hell, to this day, even the 4.6 in the new Mustang puts down less power to the wheels then the first iteration of the GM LS1, which is damn near 10 years old now.
If you want a Ford motor, go with the 302, or better yet, yank a 351 Windsor out of a Fullsize Bronco (5.8 V-8) and toss that in. They respond very well to modifications and are the same size dimensionally as the 302, but give you more of the low end grunt you want off road.
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You're biggest issue with going with the 4.6 V-8 is the width of the motor. With DOHC's that sucker has a wide and large cylinder head assembly, which might not clear the inner fender's of your Jeep..
It looks close but it should fit.
The overall width of my 06 Mustang engine bay between the shock towers is 35", but the engine doesn't even fill it. The two tabs in the picture are 30" apart, and the 4.6 is a couple inches less than that. The width of my TJ engine bay is 30". Snug fit but should be doable. Headers is another story.
I personally would do a small block Chevy. If budget allows, check out the ZZ383 - put fuel injection on it and it would be an awesome jeep motor! Best bang for the buck crate motor would be the RamJet 350.
Coming from a mustang builder, I would put a small block FORD in any day. As a matter of fact in the future, I will. Naturally it will be a stroker. 331+ of good ole push rod power. The SOHC 4.6's are kinda wide but not as wide as the 3 valve in the pic above. You can buy an intake to carb the OHC motor, I beleive Edelbrok carries it now. But as mentioned above, the "stock" 302 didnt have alot of HP, but it did pretty decent on the trq. but a new H/C/I combo will net you over 300 easy on a stock bottom end.
Just throwing in my two cents here. Have you looked into a 5.7L Hemi swap? There are a few guys around here that have done it. The motor only weighs 55 pounds more than the 4.0L so you don't need to do anything to your front end to support it. I know of a few shops that sell pre-fab exhaust and radiators for the swap. I found a few Hemi's on Ebay with the 5 speed auto trans and full wiring for around 2500 or so. I don't remember the magazine that did the story, but one of the fourwheeler mags did the Hemi swap in the "Teal-J" jeep. They have a 5 or so page write up on it and photos of the swap. You can even send your factory under the hood wiring in and have it "rebuilt" to plug right in to the new motor with factory conections.
Most of the people that I know that have done the swap, swear by it.
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Wow! That's a lot of input for less than a day's time since I posted. Thanks everyone for your advice and here's what I'm thinking. First off, I'd love to do the Hemi swap and I read the article on Teal-J, but I think that's a little out of my price range. Second and I know this will get a lot of hate, but I just can't stomach the idea of a SBC in any of my vehicles. I have a '95 4.6L in a Thunderbird (I also have PI heads and Intake for it to bump it up to about 260hp) so I guess measuring for the engine bays would be a good idea. I thought about a 5.4L or also a 5.8L, but the 5.8L at least, is about 100lbs heavier and I can get the same power out of a 347 stroker. Another advantage of the 4.6L, if it will fit is that the explorers have aluminum blocks, which would make them lighter still. As far as regearing again, I really don't want to go any taller because my first gear is already close to a granny gear and my rpms are pretty high on the hwy. Right now it's looking like the 302 would be the way to go. Cheap easy power, efi and according to what you guys are telling me, it'll fit better, too. I'll keep everybody posted on any developments and thanks again for your input!
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If you really go the 5.0 route make sure you get a HO stang version. THe regular 5.0 with single exh was only rated @ 155-160HP and 245-260TQ.
They are great little big bvore engines that will fit where other V8s only wish they could.
The 4.6 engines have a power band that is at a higher rpm and not so great for 4x4s combine that with the fact they are MUCH wider than 5.0 V8.
If mine I go with a big vlave, different cam, and a stroker crank for the same power as a 5.0 with the reliability of a inline Six.
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