Looking for good 258 builds... - JeepForum.com

 
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post #1 of 14 Old 06-09-2009, 12:37 PM Thread Starter
243
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1978 FSJ Cherokee 
 
Join Date: Sep 2002
Posts: 3,373
Looking for good 258 builds...

...if you have links to favorite builds (including you own) post them here. Stock, stroked, 4.0 conversion, turbo, supercharged it does not matter.


1978 Cherokee, TBI 360/T400/QT...6.0/6L80/NP241C in the works...
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post #2 of 14 Old 06-09-2009, 02:10 PM
myzoo
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i have not started my build yet, but noting can beat the power of some neon lights under the hood......and cant forget stickers like NOS and stuff like that.
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post #3 of 14 Old 06-09-2009, 09:37 PM
Lawless_Jeep
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Stickers, yes! Gobs of them too! And even though Hooker doesn't make a header for our 258s, it sure is a cool sticker to have.

Jeeps are sorta like cats, but tend to have more than just nine lives.
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post #4 of 14 Old 06-09-2009, 10:51 PM
jooper84
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There ain't much you can do to a 258 that'll make it more than it is. If you need V8 power, get a V8. The 258 is a great motor. Get it a good spark and a reliable carb and it'll chug away. Beyond that, you get more for your money by dropping in a motor with a couple more cylinders.
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post #5 of 14 Old 06-10-2009, 04:36 AM Thread Starter
243
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WTF are you guys talking about?

1978 Cherokee, TBI 360/T400/QT...6.0/6L80/NP241C in the works...
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post #6 of 14 Old 06-10-2009, 05:40 AM
78CJFIVE
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Mine is a good build!

She's mostly stock 258, Carter 1 barrel, Halfway rushed (only did the e-coil, wires, and cap), The PCV system keeps my air filter nice and lubricated, the canister doesn't like to be connected, the rear main leaks, has vaccum lines disconnected to help suck up some of that heat under the hood, bypassed radiator overflow and plumbed it to whatever is underneath me at the time, needs rings, top of radiator shroud missing... and the list goes on!

Fires right up and purrs like a kitten!

Got to love the 258!
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post #7 of 14 Old 06-10-2009, 07:37 AM
SlikRic
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Quote:
Originally Posted by 243 View Post
WTF are you guys talking about?
^X2^ Mine is still original with the Team Rush and can smoke all 4 tires and run 85 all day down the interstate.

United States of America
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post #8 of 14 Old 06-10-2009, 10:34 AM
jooper84
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Quote:
Originally Posted by 243 View Post
WTF are you guys talking about?
I think the general consensus is that building up a 258 costs a lot of money and returns little gain in horsepower and/or torque. It's cheaper to add lights and stickers and some fast looking paint than to spend money trying to turn an inline 6 into more than it is.

For generally the same money as building a 258, you can swap in a SBC or AMC 360 or 401 and have way more motor than any "built" 258.
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post #9 of 14 Old 06-10-2009, 09:47 PM
Lawless_Jeep
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Quote:
Originally Posted by jooper84 View Post
I think the general consensus is that building up a 258 costs a lot of money and returns little gain in horsepower and/or torque. It's cheaper to add lights and stickers and some fast looking paint than to spend money trying to turn an inline 6 into more than it is.

For generally the same money as building a 258, you can swap in a SBC or AMC 360 or 401 and have way more motor than any "built" 258.
He's right. Though I spent nearly 4 grand on my 258 build to get 275 horse and 311 ft lb of torque, for the same money, I could've had a pretty sweet V8 with more power. But, I already knew what a V8 could do, I didn't know what could be done with a 258. After balancing, blueprinting, porting and roller rocking thing, I know now. It's rather satisfying to tell someone they've been stomped by a straight six though. hahaha

Jeeps are sorta like cats, but tend to have more than just nine lives.
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post #10 of 14 Old 06-10-2009, 10:06 PM
csharrow
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post #11 of 14 Old 06-11-2009, 02:27 PM Thread Starter
243
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^^^ thanks for the link to pirate, I never thought about searching over there.

I have used Google for hours an hours and found some decent information, but this post was simply to tap into what others may have found and from their own 258 builds. I even bought the Inline Six book by Leo Santucci in case it had any information that would apply to all inline sixes. I am a member at Stovebolt, Inliner's.org etc.

Nowhere in my opening post did I say build a 258 to make the same or more power than a V8. So responses not providing information requested are pure BS. I still have my TBI 350 in the garage but that is not where I want to go with this build; I like the thought of 200 ft-lbs of torque below 2000 rpm.

1978 Cherokee, TBI 360/T400/QT...6.0/6L80/NP241C in the works...
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post #12 of 14 Old 06-11-2009, 02:27 PM Thread Starter
243
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Quote:
Originally Posted by Lawless_Jeep View Post
He's right. Though I spent nearly 4 grand on my 258 build to get 275 horse and 311 ft lb of torque, for the same money, I could've had a pretty sweet V8 with more power. But, I already knew what a V8 could do, I didn't know what could be done with a 258. After balancing, blueprinting, porting and roller rocking thing, I know now. It's rather satisfying to tell someone they've been stomped by a straight six though. hahaha
Do you have a website or documentation of your build?

1978 Cherokee, TBI 360/T400/QT...6.0/6L80/NP241C in the works...
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post #13 of 14 Old 06-11-2009, 02:58 PM
Lawless_Jeep
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Quote:
Originally Posted by 243 View Post
Do you have a website or documentation of your build?
Other than a few photos, a list of the parts used and the receipts, no. In hindsight, I really wish I would have photo documented and at least had a Thread describing the build.




Jeeps are sorta like cats, but tend to have more than just nine lives.
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post #14 of 14 Old 06-11-2009, 03:10 PM
swatson454
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I'm with you, 243, and Lawless on this one. It doesn't take rocket scientist to source a v8 and drop her in. I've decided to stick with the 258 and see if I can apply what I've learned from high output v8 builds to the 258. I've got a lot of research to do so I can't give you advise yet but my first area of concern would be the heads. My first phone call was going to be to Motor Machine and Supply in Tucson to see if they have any experience with the I-6 head.

What's interesting is that I have a 383 that made 485hp sitting right in the garage. For some stupid reason, I'm still more interested in doing the I-6.
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