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Unread 07-18-2014, 08:25 PM   #1
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1965 CJ5 
Join Date: Jul 2014
Location: Santa Cruz, CA
Posts: 6
65 cj5 motor conversation

I just bought a stock 65 cj5 it came with a cracked f head 4 cylinder it has the stock 3 speed tranny. What are my options with motor swaps without switching up everything if possible. It's my first jeep so I'm not sure what I can do. Any help or info would be greatly appreciated.

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Unread 07-18-2014, 09:06 PM   #2
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1963 M-38 
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Location: Lexington, SC
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Nothing else bolts right in. Another 4 cyl of the same make would be cheapest. Unless you find a motor/tranny/tcase combo that was in a CJ5, then you get the conversion motor mounts and driveshafts. Buy them together you save a bit more money, than buying individual adapters and gear boxes etc. They do come up for sale when someone totally reworks a rigs drivetrain. BUT in a nutshell repalcing motor with a good used maybe the best bet.
Dan Stewart
1963 M38a1
1991 Wrangler
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Unread 07-19-2014, 08:34 AM   #3
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1955 M-38 
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find another head. any swap is going to cost a small fortune. or find another engine. or you can go take a loan out and do this.
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Unread 07-19-2014, 01:06 PM   #4
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1971 CJ5 
Join Date: Jan 2002
Location: Eagle Point Oregon
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A V8 conversion is going to cause you to hack the radiator mount/grill.
There are a couple of options, including the popular Buick and Vortec V6, that will fit in the existing engine bay.
You can also go with a modern 4 out of a Ford or Chevy.
All conversions will include motor tower mods/replacement, exhaust work, transmission adapters, linkage work, clutch, and rewiring, just to name the biggies. Years ago, one could find a 66-71 CJ wreck and salvage the stock 225 and usually the drivetrain to boot, and drop it in "in mass". these are a rare bird to find now, so that option isn't really viable.
If you are interested in swaps, hit the Novak knowledge center and do some research.
Also, an engine swap in ECJ's is usually accompanied by either a gearing swap or an overdrive, as the rigs are geared low to compensate for the low power output of the stock engine, so that will be another expense.
Personally, I would repair the existing engine, drive it and enjoy it. Later on, after you have worked all the bugs out of it (bad steering, ginky brakes, worn bushings, and the inevitable lift), you can look to upgrading in the power department.
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Unread 07-19-2014, 08:13 PM   #5
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1979 FSJ Cherokee 
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So what's with the hose bib in the Engine compartment? I'm confused on that one
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Unread 07-20-2014, 06:17 AM   #6
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Unread 07-20-2014, 08:04 PM   #7
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1963 CJ5 
Join Date: May 2014
Location: Ventura, Ca
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Does the 225 v-6 bolt up to the current 3 speed?

Mine has the t-90 3 speed to the v-6...not sure if it is completely different or just a bellhousing swap?
Jeep...the first vehicle on the moon.....next trip we are bringing the tub!

It is gunna cost more and take longer than you thought...plan ahead!
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Unread 07-20-2014, 10:10 PM   #8
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1970 CJ5 
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Location: Colorado Springs CO
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You can put a 225 (or a Chevy V6) in front of a T90.
You have to buy a trans to bellhousing adapter, & install a longer input shaft.
This requires disassembly of the trans.
It goes without saying that you'll need new motor mounts, & pretty much every thing else under the hood.
"It's better to have loved and lost, than to live with a psycho the rest of your life"
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