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Old 01-02-2019, 10:55 AM
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Anyone Daily driving a sbc or ls powered yj

So i bought a 350 from a buddy the other day for $150. Came out of a municiple truck late 70's with under 70k miles on it. Ive been planing on replacing the 2.5 with a all aluminum 5.3 out of a truck or envoy/trailblazer, but now that i have this very clean 350 would i be a fool to not use it?....would like some input from guys that have run sbc's in there wrangler on the street or from someone that has driven a ls powered wrangler. Also i would be putting a carb efi setup on the 350 and a sm420 or sm465 trans behind either engine.

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Old 01-02-2019, 11:03 AM   #2
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350 from the late 70s is not exactly a high performance engine. Take a look at the specs on a late 70s Corvette. The engines were burdened by smog equipment:

I wouldn’t waste the effort to install the engine unless you are bored.

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Old 01-02-2019, 11:43 AM
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350 from the late 70s is not exactly a high performance engine. Take a look at the specs on a late 70s Corvette. The engines were burdened by smog equipment:

I wouldn’t waste the effort to install the engine unless you are bored.


Motors not staying stock, but not over building it....i know what the motor is and what it isnt...not looking for opinions on what small blocks are better...im looking for feedback from people that have driven sbc powered wranglers and ls powered wranglers
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Old 01-02-2019, 11:59 AM   #4
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So what exactly is it that you want to know?

If you're familiar with the power level in the engine then you pretty much know anything you need to know about how it'll feel to drive the Jeep with one in it.

It'll drive just like it does now except with a lot more power.... of course the sm465 or sm420 we'll make it a slow pig compared to any other transmission.
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Old 01-02-2019, 12:34 PM   #5
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I have a carbed 350 with vortech heads, backed up by a TH350 in mine. Dyno'd at 327/375. While not a daily driver, i do put quite a few miles on it. I plan on putting a 700r4 in it to calm the rpm's down at speed. Runs great, crappy mileage, what else do you want to know?
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Old 01-02-2019, 12:50 PM
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I have a carbed 350 with vortech heads, backed up by a TH350 in mine. Dyno'd at 327/375. While not a daily driver, i do put quite a few miles on it. I plan on putting a 700r4 in it to calm the rpm's down at speed. Runs great, crappy mileage, what else do you want to know?
Just want to know what road manors are like. Going from a 3xxlb motor to a 5xxlb motor on such a short wb has to have some effect. I enjoy driving the jeep alot just the lack of power annoys me also looking to get a set of vortec heads and a decent towing cam....also what gears are you running?
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Old 01-02-2019, 01:21 PM   #7
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Nah, it doesn't make any appreciable difference...
A 4.0 weighs just as much as a 350 and they drive just like the 2.5 does...
Your trans and t case will be a fair bit heavier but that weight is dead center and low, you won't notice it either...

MY gearing won't mean much to you.... the gears you need to run will be based on your tire size, engine, transmission, and use of the vehicle....
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Old 01-02-2019, 01:34 PM   #8
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no difference in drive-ability except for the power. I have an 8.8 in the rear with 4.10's and 34" tall Nitto's.
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Old 01-02-2019, 01:35 PM
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Nah, it doesn't make any appreciable difference...
A 4.0 weighs just as much as a 350 and they drive just like the 2.5 does...
Your trans and t case will be a fair bit heavier but that weight is dead center and low, you won't notice it either...
Ok didnt realize the 4.0 was that heavy....thats good to hear
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Old 01-02-2019, 01:47 PM
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no difference in drive-ability except for the power. I have an 8.8 in the rear with 4.10's and 34" tall Nitto's.
Ok looking at picking up a 8.8 as well once it warms up. Nice theres no real difference in drivability exept it having more power lol...what radiator and headers are you running?
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Old 01-02-2019, 02:41 PM   #11
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My rad came from Oconee offroad...
I'm running cast iron manifolds.
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TJ dash speakers that actually rock! Kicker sub and amp in center console
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Old 01-02-2019, 03:24 PM   #12
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For most of us, cost of any mod is an issue.
I don't think headers are any benefit at low RPM where much of our off-roading is done.
Gottagofast is using cast iron manifolds (presumably stock). If they'll work for you, I suggest spending the money that you'd spend on headers for some other necessary parts.
You'll still probably have to have a muffler shop custom build an exhaust system.

Based on the direction of the thermostat housing neck and the water pump inlet, I'd check around the Pick & Pay lots for a radiator that has compatible openings and will fit the mounts on your grill panel. That might save the cost of a specialty radiator. Get the shroud too if you're not going to use an electric fan.

For me, I'd rather have standard shift. I think a standard trans and bell housing might weigh less than a auto trans with a torque converter full of trans fluid.
JMHO.

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Old 01-02-2019, 10:03 PM   #13
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Fwiw, if I had headers, I'd toss em in the scrap heap and buy brand new cast manifolds before I'd worry with cracks, rust holes, blown out gaskets...
Some manuals weigh less than auto but not an sm465.... it's big, cast iron, and HEAVY, especially with the cast iron np205 behind it...
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Currently in the stable: ... 97 tj 4.0 5 speed stock....04 tj 4.0 auto 4" and 33's... 98 tj roller for future build... 94 yj sahara 4.5" RE and 33's... 92 yj sbc 3/4 ton axles and 38's... Cj5,7,yj,xj,ex mud dragster project

TJ dash speakers that actually rock! Kicker sub and amp in center console
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Old 01-02-2019, 10:23 PM   #14
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Generally, shorty headers are for lower end torque, long tube headers are for hp.
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Old 01-05-2019, 09:28 PM   #15
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I have a set of Sanderson ceramic coated shorty headers sitting on the shelf ready to replace the cast iron ram horns on my new engine. I bought the Sandersons on Craigslist, brand new, really cheap. They are the same ones Novak sells.

I'll do the entire exhaust when I put the headers on, 500 miles or so. I should pick up a nice gain on both HP and trq when I do it. They should also help keep it a little cooler in the engine bay.

Normally I agree with Gottagofast on pretty much everything, but have to disagree on the headers. I've put quality headers on pretty much every hot rod i've ever owned and never had one leak, rust out etc.

Sandersons have a pretty unique mounting system and the first time I used a set I thought no way will this work. Sold the Mustang about 45k miles later and they didn't leak and looked great.
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Old 01-05-2019, 09:42 PM   #16
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I'd be tempted to keep looking for a 5.3 (iron or aluminum) over the 350. By the time you make your performance modifications and add fuel injection you will be well over the price of a junkyard lm7 with harness.

Also, LS is an easier fit (throttle body on the front of the intake instead of the top and no distributor)

What from axle and transfer case are you thinking about using behind the sm420 or 465?

I've put just over 8k on my LM7/4l60e/231cj/8.8 equipped YJ. Drives fine, weight difference is minor, fuel economy didn't change much, driveability is significantly better
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Old 01-06-2019, 12:23 PM   #17
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Drive mine every day. Just such a blast, step on the gas and this thing is taking off like crazy.
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Old 01-07-2019, 07:05 AM
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I'd be tempted to keep looking for a 5.3 (iron or aluminum) over the 350. By the time you make your performance modifications and add fuel injection you will be well over the price of a junkyard lm7 with harness.

Also, LS is an easier fit (throttle body on the front of the intake instead of the top and no distributor)

What from axle and transfer case are you thinking about using behind the sm420 or 465?

I've put just over 8k on my LM7/4l60e/231cj/8.8 equipped YJ. Drives fine, weight difference is minor, fuel economy didn't change much, driveability is significantly better


Yeah thats kinda why im having such a problem deciding lol... i can have the sbc with the work done to it running a carb
For about 800 or less, but really want efi....Looking to check the junkyards for a 8.8 when it warms up a bit...probably going to run a chevy 241 front housing/internals and jeep rear housing/ tailshaft with sye and going to keep the hp 30...i guess i should stick with my orignal plan and see what ls i can find in the junkyards and go from there...
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Old 01-07-2019, 07:06 AM
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Drive mine every day. Just such a blast, step on the gas and this thing is taking off like crazy.[IMG class=inlineimg]https://www.wranglerforum.com/../images/smilies/action-smiley-035.gif[/IMG]
Very nice! Sure looks like a blast...what kind of mpg are u getting?
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Old 01-07-2019, 11:24 AM   #20
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If Dash-command is accurate, it says 22.4 average.
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Old 01-07-2019, 11:48 AM   #21
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VERY VERY VERY highly doubt that
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TJ dash speakers that actually rock! Kicker sub and amp in center console
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Old 01-07-2019, 12:17 PM   #22
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VERY VERY VERY highly doubt that
Have to agree on that mpg reading being off. Never had a stock or lightly modified 350 ever get better than around 16 mpg either naturally aspirated or FI.
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Old 01-07-2019, 12:39 PM   #23
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Manny is not running a 350.. He is running a 5.3. I have heard many people getting similar MPG numbers.

I have a TBI 350 in mine, but it is certainly not a dd. It is great and has more that enough power for a YJ. As far as a comment earlier about a LS fitting better, they both fit just fine. There is tons of room for a SBC with room to move forward or back as necessary. I only went with the TBI engine because I got if for nothing. I would absolutely, without question, put a LS engine in there if I had to even do a little work to the old SBC. The LS engines are so much more efficient and can be build to make power so much easier. A cam and a set of headers will get you around 400 HP. How much do you need to spend to get a SBC there?
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Old 01-07-2019, 03:22 PM
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If Dash-command is accurate, it says 22.4 average.
Dang lol thats pretty much what the tiny econobox i drive to work everyday gets!!!

Lol i was gonna be impressed with 15-18 mpg, guess im just gonna have to wait till spring to go ls engine shopping
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Old 01-07-2019, 03:28 PM
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Manny is not running a 350.. He is running a 5.3. I have heard many people getting similar MPG numbers.

I have a TBI 350 in mine, but it is certainly not a dd. It is great and has more that enough power for a YJ. As far as a comment earlier about a LS fitting better, they both fit just fine. There is tons of room for a SBC with room to move forward or back as necessary. I only went with the TBI engine because I got if for nothing. I would absolutely, without question, put a LS engine in there if I had to even do a little work to the old SBC. The LS engines are so much more efficient and can be build to make power so much easier. A cam and a set of headers will get you around 400 HP. How much do you need to spend to get a SBC there?

Kinda in the same boat thats the only reason ive considered running the sbc...its a very clean 4 bolt main 350 (internals look like the motor was never ran its so clean) kinda hard to say no for $150...dont care if it sits in a corner of the garage i wasnt gonna pass up the offer.
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Old 01-08-2019, 01:40 PM   #26
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I have to agree there. I doubt I could pass that up either.
Couple'a points from my perspective. Obviously (based on my sig) I run a SBC, but a 283. Not a ton of power, AX15 and NP231 handles the power with no issue. Gets CRAPPY mileage, although better than expected, but it looks really cool in there, love the feel and the sound. I be happy.
And as far as engine choices: I'm trying to restore an MGB. Very torn between leaving it stock, or stuffing something in there. Ford 289 would be my first choice, but if a Buick V6 fell in my lap, no way I'd turn it down right now, then decide later if I want to put it in.
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Old 01-08-2019, 05:26 PM
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I have to agree there. I doubt I could pass that up either.
Couple'a points from my perspective. Obviously (based on my sig) I run a SBC, but a 283. Not a ton of power, AX15 and NP231 handles the power with no issue. Gets CRAPPY mileage, although better than expected, but it looks really cool in there, love the feel and the sound. I be happy.
And as far as engine choices: I'm trying to restore an MGB. Very torn between leaving it stock, or stuffing something in there. Ford 289 would be my first choice, but if a Buick V6 fell in my lap, no way I'd turn it down right now, then decide later if I want to put it in.
I bet that 283 runs great in your yj any work done to it?....also i knew a guy that ran a turboed buick gn motor in a 32 coupe and wow was that thing fast!!! That mgb would be a nice sleeper with a buick v6 turboed or not......i cant leave anything stock (if you havent noticed) so i vote a turboed buick v6 lol
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Old 01-08-2019, 05:36 PM   #28
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A gen 2 supercharged 3800 would be nice too.

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TJ dash speakers that actually rock! Kicker sub and amp in center console
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