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Unread 08-03-2013, 05:07 PM   #1
tensley
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1990 FSJ Wagoneer 
 
Join Date: Jul 2010
Location: Alabama
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Engine Swap Questions

Hello my Jeep brothers and sisters! I have just bought a 1990 JGW. The drive train is still completely stock. I had the cat cut off and new pipes and muffler installed. The motor needs to be rebuilt as does the tranny. Instead of rebuilding the 360, I have been thinking of swapping in a more powerful motor&tranny that is already running. It is a 1971 mopar 440 with a matching auto tranny. All it needs is a 4 bbl carb. Will this set up work? The motor and tranny combo is only $400. Ive got all the tools necessary for pulling and installing the motors. Im gonna do away with all emissions. Will this combo fit in a 90 JGW. What will need to be done that is expensive?
Has anyone done this? If so what is the difficulty of it?
The parts are becoming few and getting expensive for the AMC 360's. The parts for the 440 are plentiful and affordable. Any help or advice will be greatly appreciated. Thanks

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Unread 08-03-2013, 05:47 PM   #2
RockRollin
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The width is an issue, as well as the length. Will most likely lose the heater box, the fan will not leave room for a radiator. However anything is possible if you want to do massive fab work to the core support, and firewall.
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Clawed: 90GW, TFI, Streetfire, 3"lift all spring, 31"BFG ATs, working RKE, Edel2131, Holly 1850, mild cam,
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Unread 08-03-2013, 05:59 PM   #3
jeeper54
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Anything can be accomplished with enough time & money. Off the top of my head, basic changes; radiator, engine mounts, trans mount/cross member, linkage, exhaust, wiring, transmission (AMC to mopar=different output shafts & tailhousing. Won't mate to 229 tc), etc. I had a complete low mileage 440 & trans at my disposal for free couple years ago but I wouldn't do it even if I could. Myself, I would rather invest the money into building the 360 or try to find a complete running 401. But that's just me & I'm a simple minded man.
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Unread 08-03-2013, 06:19 PM   #4
tensley
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I was thinking there would be a lot to it. I will rebuild the 360 and just invest in performance parts to give it more HP and torque. Cam, carb, pistons, ect..ect. I will also look for a early model 390 and 401 as well. Thanks a lot for yall's help.
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Unread 08-03-2013, 07:03 PM   #5
RockRollin
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It doesn't take a lot to bring a 91 360 to respectable performance levels. If you get the compression to 9-10:1 you'll have a huge head start. With just cam, intake, ignition, carb, and degreeing the cam, I can walk away from most traffic, and hang aroung the 14mpg mark.
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Clawed: 90GW, TFI, Streetfire, 3"lift all spring, 31"BFG ATs, working RKE, Edel2131, Holly 1850, mild cam,
05 Renegade OME 927, 947, top plate, JBA 4.5s
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Unread 08-03-2013, 07:16 PM   #6
tensley
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That's exactly what Im looking for. I wont really go off road much if any, but I like the fact that the option is there if I want to. And have plenty of HP/Torque to do it with. Then get on the road and have some get up and go.
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Unread 08-03-2013, 07:56 PM   #7
tensley
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Hey Rock, Which is better for performance the air gap or torker 1 or 2 edelbrock intake manifolds? I can get the older style torker (the one that the carb sets at a angle) for 125. What is the difference between the torker 1 and the torker 2? Thanks
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Unread 08-03-2013, 08:15 PM   #8
RockRollin
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Quote:
Originally Posted by tensley View Post
Hey Rock, Which is better for performance the air gap or torker 1 or 2 edelbrock intake manifolds? I can get the older style torker (the one that the carb sets at a angle) for 125. What is the difference between the torker 1 and the torker 2? Thanks
All the above are higher rpm range intake manifolds, the torker is anything but a "torque making" manifold (single plane=high rpm).
For low end torque the 2131 Edel is about the best currently produced option. The air gap I have no experience with (I think the range is 1500-6000rpm), whereas the performer 2131 is off idle-5000rpm, you'll be hard pressed to see 5000rpm with am AMC 360 (low end torque motor).
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Clawed: 90GW, TFI, Streetfire, 3"lift all spring, 31"BFG ATs, working RKE, Edel2131, Holly 1850, mild cam,
05 Renegade OME 927, 947, top plate, JBA 4.5s
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Unread 08-03-2013, 08:52 PM   #9
carnuck
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There is a motor mount kit to put the 440 in the FSJ but you still need a big enough rad, exhaust, wiring, etc. Including a bigger fuel tank!
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Unread 08-05-2013, 10:16 AM   #10
super98lsc
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Man 440 is a wide beast. Neighbor has one in his 67 Satellite (GTX Clone) You can setup camp on the intake.
I have the RPM Air-Gap, I have run several before (have not installed mine on the 360 yet) but it has a nice pull from 1500-6500. When swapping from a Performer to the RPM or RPM AirGap I found the bottom end TQ to feel the same at least no noticeable loss in seat of pants feel but the power from 2300 up was vastly stronger. The RPM Air Gap is still a dual plane intake it just offers a lot more cross sectional area and plenum with a better shot at the valves. IMHO is one of the best intakes ever made for the street. I have run them on 383 strokers (SBC) that were 450-610hp depending on the head/cam combos, and have one on the built motor in the olds 442. I would avoid a single plane at all cost in a big heavy Jeep. A victor Jr for example will come on hard above 3500 but for any normal driving on the street my wagon is shifting around 2500. As rock mentioned a compression bump = an awesome gain in performance and efficiency provided to map the spark accordingly. I will be installing a fairly warm cam in mine with a compression bump to offset overlap. (DCR will be low enough to run street fuel fine) and using a Holley HP 750 for my initial setup until I build out the injection system later. Based on my past experience with the cam profile/intake/ compression this engine should make very good street power up to 5k. Just my .02 well see how it all works when I finally get it built. ROFL
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