Is a 360 better than a 258 I have the HP/torque#s! - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 02-14-2001, 09:28 AM Thread Starter
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Is a 360 better than a 258 I have the HP/torque#s!

I was thinking about swapping a 360/TF727 into my Scrambler project, but now that I have seen the HP/Torque numbers it doesn't look like the 360 is much better than a 258.
1981-86: 360=129lbft and 245HP
1980&82: 258=118lbft and 205HP

There is not much difference and I am sure the 258 develops max torque at a lower rpm. By doing the usual 258 mods(TR or HEI, Weber, removing emissions, I would bet that the 258 could equal or surpass the 360's numbers.

Am I crazy to think this? You guys with 360's prove me wrong. Aren't there more parts available for a 258? Why would I want the 360?

Thanks,

Here is the chart for all AMC engines:
http://www.wagoneers.com/john/JEEP/engines.html


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post #2 of (permalink) Old 02-14-2001, 09:34 AM
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Re: Is a 360 better than a 258 I have the HP/torque#s!

I think that may be for the 304 in the late 70's, but I'm not buying those numbers for the 360. I have the manuals at home, so I'll look up to see what they should put out and post back. Where are the numbers for the '73-'80 304?

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post #3 of (permalink) Old 02-14-2001, 10:50 AM Thread Starter
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Re: Is a 360 better than a 258 I have the HP/torque#s!

I was hoping those numbers were wrong. Please let me know what the "real" numbers are.

Thanks,


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post #4 of (permalink) Old 02-14-2001, 11:27 AM
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Re: Is a 360 better than a 258 I have the HP/torque#s!

depending on what you want to do with your jeep.. but you can get more rpms out of a v-8... as apposed to that I6.. i had a built I6.. and it had some good power.. more than my friends new crate 305... but.. i also like hitting the mud now and again.. where you want higher rpms.. and a v-8 is alittle better in that respect..

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post #5 of (permalink) Old 02-14-2001, 11:29 AM
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Re: Is a 360 better than a 258 I have the HP/torque#s!

You have the torque and hp numbers backwards, otherwise I believe they are close.

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post #6 of (permalink) Old 02-14-2001, 11:32 AM
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Re: Is a 360 better than a 258 I have the HP/torque#s!

"Why would I want the 360?"
My thoughts exactly. I just put a new motor in my CJ-7, coulda put anything I wanted in, put in a nicely rebuilt 258. Gotta love that low end torque, and you can't beat the durability of the 7 main bearing design of the 6.

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post #7 of (permalink) Old 02-14-2001, 11:47 AM
 
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Re: Is a 360 better than a 258 I have the HP/torque#s!

http://www.off-road.com/jeep/tech/engine/amc360.html

Check out this page. It tells the truth about the 360's power. It's a SERIOUS power upgrade from a 258! Yes, you can build a 258. You can also build a 360! I did.

'86 CJ-7, 360, T-176, Dana 44 rear w/Truetrac, Dana 30 w/Powertrax No-Slip, 4" Superlift, 4:11s, Warn HS9500i
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post #8 of (permalink) Old 02-14-2001, 11:51 AM
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Re: Is a 360 better than a 258 I have the HP/torque#s!

REMEMBER!!!! Those numbers are for emissions choked engines! Both engines were limited by the same smog restrictions, but the 360 had to have more power cut out to meet those restrictions, so the smog laws evened the playing field between the engines. Remove the smog equip, and watch the 360 blow the 258 away. The 258 will make its peak torque lower than the v-8, but the v-8 can produce the same torque at the same rpm, with more torque at a higher rpm. Its all in how you build it, and remember, there's no replacement for displacement.

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post #9 of (permalink) Old 02-14-2001, 12:40 PM
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Re: Is a 360 better than a 258 I have the HP/torque#s!

But, looking strictly at reliability from a design standpoint, I still maintain you can't beat the seven main bearing 6. If its hp you're after, sure can't beat a V8. I've built some screamer V8s, but I wouldn't have wanted any of them in a 4by, except for the killer 350 Olds. Hmm, a thought there.

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post #10 of (permalink) Old 02-14-2001, 01:29 PM
 
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Re: Is a 360 better than a 258 I have the HP/torque#s!

jeepgod said it- It depends what you want to do with the jeep. If all you want to do is crawl, the 258 is fine. But I can make the same or better torque numbers at the same RPMs as a six, and still be able to run down the highway turning 35s AND be able to pass if I want to. I had a nice 258 (HEI, Weber, Borla header), and the power difference with the 360 is VERY noticeable!

'86 CJ-7, 360, T-176, Dana 44 rear w/Truetrac, Dana 30 w/Powertrax No-Slip, 4" Superlift, 4:11s, Warn HS9500i
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