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Old 06-14-2017, 01:07 PM
Tte531 Tte531 is offline
Join Date: May 24, 2016
Posts: 18
Amc 360 piston swap

Ok i hope some people and clarify for me what im reading regarding 360 builds.

So i have my '83 360 apart for rebuild. I like the idea of having the AMC in the car. So i dont plan to swap it out. I want the engine to be powerful enough to haul a trailer with maybe at max another car on it ovr a short distance. As of now i can haul a bare trailer and it feels like i forgot to install the axles before i pulled it.....

I have edelbrock everything but at the end of the day i only have 140-160 to start with.... So i guess my question revolves around the pistons.

I can mess with the crank but at one point the 360 made what 225hp? id be happy with that. From what i can read the crank never changed BUT the piston design may have. Is that true?

If it is can i swap it out for a flat piston or something like what was used in the early 70's? Doing so to raise the compression a bit from the specified what? 8.25:1? Would that help in my search for SOME power lol
1983 Wagoneer Limited 5.9L
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Old 06-14-2017, 01:22 PM
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babywag babywag is offline
out of order
Join Date: Jun 08, 2005
Location: Land of froot loops and cukcoo-nuts, CA
Posts: 9,912
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Old 06-14-2017, 06:00 PM
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Mikel Mikel is offline
Join Date: Aug 09, 2000
Location: New Haven, CT
Posts: 6,316

1969 M715 6x6
1963 J300 Swivel frame
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Old 06-14-2017, 07:23 PM
Tte531 Tte531 is offline
Join Date: May 24, 2016
Posts: 18
Hey thanks for that link. I looked everywhere and that was exactly what i wanted... Guess i should have looked harder. Now i feel like i wasted a thread... However thank you again
1983 Wagoneer Limited 5.9L
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Old 06-14-2017, 09:29 PM
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FSJunkie FSJunkie is offline
The Nigel Tufnel of the FSJ world.
Join Date: Jan 09, 2011
Location: Not The Hot Part, Arizona
Posts: 4,033
I used my Wagoneer with its stock 360 to tow a 7000 pound trailer a couple weeks ago, and I live 6900 feet above sea level where the air is so thin that engines only produce about 75% of the power they do at sea level. My stock 175HP was more like 130HP. It kills low RPM torque the most. Pulling the mountain pass was interesting. It's a 5% grade that peaks at 7200 feet elevation. I held 50 MPH up it in 2nd gear. Most everything else went pretty smoothly. It took me a long time even on a level road to reach 60 MPH from a complete stop: at least 30 seconds, but no more than 60 seconds. But I got there.

So you know it is actually powerful enough to haul a trailer.

If I may say so, it seems to me like the problem here isn't your Jeep, it's you being in a rush to get somewhere. Patience and lowering your standards helps a lot in that regard. Not comparing your old Jeep to the performance of a modern vehicle helps a lot too. Those two things are the key to happiness with an older vehicle, and it's really the cheapest way. Just think of how much you will love your Jeep when you accept those two things. You won't be constantly unhappy and wishing for more. It's like reaching nirvana.

It almost hurts me to burst your bubble, but while the published horsepower figures on the AMC 360 changed quite a bit over the years, the actual power produced at the crankshaft while the engine was actually in the car did not change much.
'72 Jeep Wagoneer Custom, 360 V8

I love how arguements end as soon as Ristow comments. Ristow is right...again.

Last edited by FSJunkie : 06-15-2017 at 02:38 AM.
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Old 06-16-2017, 06:34 AM
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Heavy_Metal_Thunder_81 Heavy_Metal_Thunder_81 is offline
Cherokee Outlaw
Join Date: Jan 10, 2006
Location: Oak Harbor, WA
Posts: 7,289
Gearing also has a lot to do with it. Being an '83 you probably have 3.31 gears at best and possibly even 2.73 gears. Both are hardly ideal for towing.
-Jonny B.
1979 Cherokee Golden Eagle - UNDER CONSTRUCTION
7" Alcan springs, BJ's HD shackles - 35x12.5x15 BFG Mud Terrains
AMC 401 - Pro-Flo 4 EFI
NV4500/NWF BB/NP205 - Triple Stick'd
F D44 - 4.10, Eaton E-Locker
R M23 - 4.10, Detroit Locker

1979 Cherokee Chief - Parts
1979 Cherokee Chief - Parts
1979 Wagoneer - Sold
1981 Cherokee Chief - Cubed
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Old 06-16-2017, 08:01 AM
rocklaurence rocklaurence is offline
Join Date: Jan 14, 2009
Location: 33812, Lakeland, Fl
Posts: 1,817
Originally Posted by babywag
This is a Kool build and I want to do this on one of my trucks.
I tow a lot with my J truck. It has the J20 3.73 axles with 34" tires. Which equals approx' 3.20 gears. So, it is slow when towing and gets bad [9 mpg] milage but it's sooo COOL!

Last edited by rocklaurence : 06-16-2017 at 08:08 AM.
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