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Old 01-27-2014, 06:42 PM   #1
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just got off the phone with the machine shop. WTF!!!

pulled my 4.2 a couple of weeks ago due to low compression and tons of blow by. machine shop is quoting me $955 in labor for machining block and rebuilding the cylinder head. I researched some overhaul kits and they are around $400-$450. So, almost $1400 just to get the old 258 back right, and that is before the new water pump, mc2100, hoses, belts, radiator, etc, etc. not to mention the fact that I will be doing the assembly myself.

I can't seem to justify going forward with the 258.

Any suggestions? V8? 4.0?

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Old 01-27-2014, 06:53 PM   #2
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that's about right...costs about 1500 for me to have one rebuilt in south georgia and our prices are probably cheap compared to most of the country.....of course I prefer a 350 chevy but I replace the entire drivetrain so that it will hold up to the power...1500 will barely get you started to do that

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Old 01-27-2014, 07:46 PM   #3
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1500 would be a good start to a 4.0 swap though! ;-)
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Old 01-27-2014, 07:47 PM   #4
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that's about right...costs about 1500 for me to have one rebuilt in south georgia and our prices are probably cheap compared to most of the country.....of course I prefer a 350 chevy but I replace the entire drivetrain so that it will hold up to the power...1500 will barely get you started to do that
yeah, that's true. just got the news, so i'm going to think it over. There are a few 4.0 cherokees in my area at a decent price. i'm seriously considering that option.
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Old 01-27-2014, 07:49 PM   #5
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1500 would be a good start to a 4.0 swap though! ;-)

i agree
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Old 01-27-2014, 10:24 PM   #6
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Having owned a 4.2 yj and a 4.0 swapped yj, the 4.0 is def the way to go if u have a good donor vehicle to grab parts from. That will keep costs down.
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Old 01-27-2014, 11:37 PM   #7
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I don't see where $1000 is all that much for what they are doing. Magna-fluxing the block, and boring it out, as well as decking and rebuilding the head. If you were in Pa. that would cost you around $1500-1800.

I put a long block motor in mine from Napa. 4.2L, it was $1950, but that was 5 years ago, so I'm sure its more expensive now.
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Old 01-28-2014, 06:13 AM   #8
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I don't think it's a question of whether the cost is too high or not, rather a question of whether its worth putting that much into a 4.2 when a swap to something better might be just as much.
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Old 01-28-2014, 06:51 AM   #9
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other than gaining fuel injection the 4.0 isn't that big an improvement over the 4.2.
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Old 01-28-2014, 08:12 AM   #10
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Honestly I would just rebuild the 258. If you were starting with a 2.5 Jeep I could understand going with something different, but your rig is already set up for the big 6.

Any swap you do will be just as, if not more costly than rebuilding the 258. Plus you'll be swapping in a motor you know nothing about (unless you plan on rebuilding it before swapping it in). It could be a clunker full of stop leak, slick 50, all kinds of crap.

The 258 will probably outlast the Jeep once rebuilt.

JMO.
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Old 01-28-2014, 12:12 PM   #11
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I don't think it's a question of whether the cost is too high or not, rather a question of whether its worth putting that much into a 4.2 when a swap to something better might be just as much.

My thoughts exactly


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Old 01-28-2014, 12:18 PM   #12
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I appreciate everyone lending their opinion. I'm really not 100% sure now which way I will end up going. There are a few Cherokees on Craigslist that are running and driving around here for $800-$1500 that might make good donors. Who knows? Still mulling it over.







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Old 01-28-2014, 07:43 PM   #13
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If there $800 to $1500 there not much unless totaled out.
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Old 01-28-2014, 10:35 PM   #14
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Honestly I would just rebuild the 258. If you were starting with a 2.5 Jeep I could understand going with something different, but your rig is already set up for the big 6.

Any swap you do will be just as, if not more costly than rebuilding the 258. Plus you'll be swapping in a motor you know nothing about (unless you plan on rebuilding it before swapping it in). It could be a clunker full of stop leak, slick 50, all kinds of crap.

The 258 will probably outlast the Jeep once rebuilt.

JMO.

^This. It would suck to put all that money into a swap just for it to be a bad motor. I say rebuild.
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Old 01-29-2014, 08:02 AM   #15
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^This. It would suck to put all that money into a swap just for it to be a bad motor. I say rebuild.
Agree 100%……Rebuild!
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Old 01-29-2014, 11:45 AM   #16
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Don't know anything about the builder but Qtec has ATX motors, remans with lots of new parts for $1699 for a 258 and 1799 for a 4.0.
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Old 01-29-2014, 02:27 PM   #17
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Rebuild the 258, Install a nice Clifford Performance Cam with a TFI ignition and CDI ignition box with a Header, intake manifold and a Carb youll be putting out 4.0L HP with close to 4.6L Stroker Torque #'s
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Old 01-29-2014, 03:40 PM   #18
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I dont know where you are located ( can't see that on mobile app), but I have a good 4.2 that needs a new home. I am in PA. If you can find a "good" 4.2 that would be the most cost effective option.
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Old 01-29-2014, 03:45 PM   #19
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I dont know where you are located ( can't see that on mobile app), but I have a good 4.2 that needs a new home. I am in PA. If you can find a "good" 4.2 that would be the most cost effective option.

Too bad you're in PA, if you were closer to OK, I would take it off your hands.
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Old 01-29-2014, 03:48 PM   #20
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That's a bit or a road trip all right. I know Wombat Ranger has one too but he is in WA. Not much better.
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Old 01-29-2014, 04:36 PM   #21
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I see these advertised alot when I am Jeep part searching. (broken arrow)
engine replacement for 2.7 3.7 4.7 and 5.7 chrysler jeep and dodge
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Old 01-29-2014, 08:06 PM   #22
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I see these advertised alot when I am Jeep part searching. (broken arrow)
engine replacement for 2.7 3.7 4.7 and 5.7 chrysler jeep and dodge

Those are late model engines.
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Old 01-29-2014, 09:24 PM   #23
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I would love to do a 5.7 hemi swap, but that would be opening up a whole new can of worms.

I'll run the 4 banger till it blows, then most likely do a 4.3 swap. I can find complete drive trains dirt cheap compared to 4.0's 4.2's etc.
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Old 01-29-2014, 09:59 PM   #24
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just got off the phone with the machine shop. WTF!!!

Well I decided to stick with the 4.2. Went to the machine shop and went over the tech's write up on everything they were saying my block needed. I work at a Mack dealer, so I know it's the name of the game to try and sell labor. Some things we determined were unnecessary. However, this a well known shop with a reputation for doing great work. The owner is a stand up guy and he went through it all with me, and we got it all straightened out. Block should be ready next week. However, I did decide to forgo the head for now as I decide on whether or not to swap to a 4.0 head.






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Old 01-29-2014, 10:36 PM   #25
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I think you'll be happy with it. I built up a 258 for my old '76 CJ-7 & loved it. Clifford cam, offy intake, 2150 carb, HEI. It was a torque monster. Ran great.

The 258 has a lot of potential.
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Old 02-01-2014, 09:50 PM   #26
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I think you'll be happy with it. I built up a 258 for my old '76 CJ-7 & loved it. Clifford cam, offy intake, 2150 carb, HEI. It was a torque monster. Ran great.

The 258 has a lot of potential.
Thanks!
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Old 02-03-2014, 08:37 PM   #27
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I've got a 4.0 ax-15 and np231 I'm selling if you'd be interested. Still in the yj but am planning on starting to remove it this weekend.
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Old 02-04-2014, 08:01 AM   #28
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Where are you located?
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Old 02-04-2014, 10:27 PM   #29
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South Dakota
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Old 02-05-2014, 08:25 AM   #30
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Too far for me. Maybe one of the other guys are a bit closer.

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