what is the cheapest/easiest v8 swap?? - JeepForum.com

View Poll Results: im a newb but most ppl seem to run 302/350s
chevy 350 carbed 19 61.29%
ford 302 carbed 0 0%
chevy 350 fuel inj 6 19.35%
ford 302 efi? 6 19.35%
Voters: 31. You may not vote on this poll

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post #1 of 23 Old 06-09-2010, 11:20 AM Thread Starter
bword
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what is the cheapest/easiest v8 swap??

Just curious what would be the cheapest and easiest v8 swap to a 4 banger 5 speed yj. I know the word cheap and easy shouldnt be in the same sentance but ive been pondering it??


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post #2 of 23 Old 07-12-2010, 01:45 AM
SunDevilJeeper
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Quote:
Originally Posted by bword View Post
Just curious what would be the cheapest and easiest v8 swap to a 4 banger 5 speed yj. I know the word cheap and easy shouldnt be in the same sentance but ive been pondering it??
just go for a 305 or 350 and use the NV3500 tranny like i was told.

302 is a good option because the distributor cap is up front vs. chevy engines having the dist cap in the back so you'll most likely have to do some cutting into the firewall if you go chevy. im doing a 350 (5.7L) swap with the NV3500.

you might also want to invest in some D44s with that swap as well, and i forget the t-case you're gonna need but bottom line is a V8 swap isn't cheap at all. i've got most of the parts i need stored at the house in so cal and i can't even remember how much the parts alone cost, im past the $1500 range for sure.

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post #3 of 23 Old 07-12-2010, 01:59 AM
karateka
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You better be a good fabricator and or very mechanically inclined. I just rebuilt my 4.2 I6 and that thing has some good low-end torque; you have a 4 banger so I understand wanting to put some more power in, but don't discount Jeep I6 motors. You can pick up a motor from a junkyard for $700-$800 and bolt it in. Check to see the process for swapping out the 4 banger for an I6. Any V8 swap is likely to require the entire drive train be upgraded. I cannot imagine a stock drive-train being able to withstand the power of a small block V8.
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post #4 of 23 Old 07-12-2010, 03:05 AM
bigbelman2009
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a jeep I6 is not a straight bolt in. the drivetrain also needs to be replaced with a 4.0/4.2 so why not spend a little bit more and have a lot more power and a stronger drivetrain? sbc is the way i am going but instead of the nv3500 im going with a 4500. just my
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post #5 of 23 Old 07-12-2010, 03:23 AM
karateka
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Quote:
Originally Posted by bigbelman2009 View Post
a jeep I6 is not a straight bolt in. the drivetrain also needs to be replaced with a 4.0/4.2 so why not spend a little bit more and have a lot more power and a stronger drivetrain? sbc is the way i am going but instead of the nv3500 im going with a 4500. just my
That is all well and good for someone who is mechanically-inclined and good at fabrication. I know basically nothing about Jeeps so I cannot give an informed opinion on it. That being said, I am mechanically-inclined and have lots of experience on SBC and SBF motors. I recently pulled my I6 out, rebuilt it, and put it back in... and THAT took a lot of improvising, fabricating, and hundreds of dollars of unexpected snags. I can only imagine the undertaking of swapping in a small block. It certainly is not as simple as taking out the 4 banger and throwing in a SBC. The OP must know that when you embark on a SBC swap, everything needs to be replaced, not just motor/transmission/transfer case.

Honestly, with the economy the way it is, it might be better just to throw a junkyard 4-banger in the jeep and BUY a jeep with a SBC, or I6.
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post #6 of 23 Old 07-12-2010, 05:30 AM
fitbmxseries1
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my jeep has a carbed 318 bolted to the stock auto torq flight 999 transmission.... all that was needed looks like engine mounts and a few miscellaneous brackets and wiring and a modified radiator.

Quote:
Originally Posted by karateka View Post
You better be a good fabricator and or very mechanically inclined. I just rebuilt my 4.2 I6 and that thing has some good low-end torque; you have a 4 banger so I understand wanting to put some more power in, but don't discount Jeep I6 motors. You can pick up a motor from a junkyard for $700-$800 and bolt it in. Check to see the process for swapping out the 4 banger for an I6. Any V8 swap is likely to require the entire drive train be upgraded. I cannot imagine a stock drive-train being able to withstand the power of a small block V8.
locally i can get a 4.0 with transmission under 100k for 300-500$ i also replaced my 350 on my sierra for 250$ from a junk yard that engine had 78k on it. Car-part.com helped alot i was able to see when somthing cheap came available at local yards. But if you do buy a motor you should regasket it all. On my 350 i took the heads off and had them checked as a precaution.
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post #7 of 23 Old 07-12-2010, 06:02 AM
ImpactFabWorks
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The 302 is the easiest swap IMO. You have the benefit of the front distributor and it weighs about the same as the jeep I6 motors. Not to mention I'm just not a chevy guy.

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post #8 of 23 Old 07-12-2010, 06:04 AM
ImpactFabWorks
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I'll post the link later since I'm on my iPod, but novak has a great page with Info on why ford motors are easier and have more benefit in a jeep.

Edit: here's the link

http://www.novak-adapt.com/knowledge...p_yj_87-95.htm

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Last edited by ImpactFabWorks; 07-12-2010 at 07:13 AM.
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post #9 of 23 Old 10-18-2013, 12:52 PM
cryder44
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I know you wanted cheap, but since none of the swaps are going to be cheap......Just put a Hemi in it and don't worry about the chevy and ford junk. lol
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post #10 of 23 Old 10-18-2013, 12:58 PM
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Junk yard 350/th400/np 205


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post #11 of 23 Old 10-18-2013, 01:21 PM
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depends. you want a new engine? GM crate engines are the cheapest non remanufactured engines

'89 YJ, 4.2L, ax-15, B&M shifter, 1" BL, TJ flares, '99 intake, '91 EFI, 5.0L explorer injectors, GenRight tank & stretch, 35" ProComp Xtreme muds, 52" chevy springs rear, 44044 Ranchos front.....
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post #12 of 23 Old 10-18-2013, 01:45 PM
superj
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Ford engine, ford trans, for tcase. Ford is driver side drop on 4x4 so axles won't need swapping

I don't feel like working on anything at this time so i sold my yj.
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post #13 of 23 Old 10-18-2013, 01:53 PM
imstillatwork
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You cannot discuss V8 motor swap costs without including the cost of a new rear axle at least. The OP's profile is not filled out so I must assume it is a D35.
Any V8 that the D30 can handle would not be worth the effort over a 1995, so add in the cost of a new front axle as well.

OP has a 1995 2.5 judging by the post (profile not filled out...) a 4.0 is rather simple overall with the major hurdles being cut and move motor mounts, and add two wires to the ECU harness.

Either way you need motor, trans, relocated or custom motor mounts, modified or new transfer case.
A MPFI V8 will require a complete rewire. I guess you can swap in a carbed V8, but man, three steps backwards for a little more power than the 4.0???
A 4.0 just needs it's ECU and two more wires.

I fully believe the cheapest and easiest v8 worth swapping will never be as cheap and easy as the 4.0 swap.

just food for thought. I'm really not anti-v8 I just think too many people get into the more is bigger is better mentality.
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post #14 of 23 Old 10-18-2013, 01:56 PM
fishadventure
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Quote:
Originally Posted by SunDevilJeeper View Post
...302 is a good option because the distributor cap is up front vs. chevy engines having the dist cap in the back so you'll most likely have to do some cutting into the firewall if you go chevy. ....
Since a 350 is shorter than a 6 cyl and a 6 fits just fine I am confused as to why a 350 would require cutting the firewall. There is plenty of room for a V8 in a jeep without cutting the firewall. I am in the midst of converting a 4cyl to a I6 cylinder engine. From my observations in prepping and starting this project, ANY of the mentioned V8s are going to be about the same amount of work, IMHO.

The AX5 tranny will have to go, but the transfer case will probably be fine unless you beat it. The rear axle will probably be the weakest link in the combo.
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post #15 of 23 Old 10-18-2013, 02:03 PM
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Talk about a thread resurection....
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