CJ7 motor swap to a 350. - JeepForum.com

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post #1 of 6 Old 07-25-2006, 09:56 AM Thread Starter
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CJ7 motor swap to a 350.

Ok, I have a 258 I6 that is worn out. I am thinking of doing a swap to a 350. I found a great deal on an LT1 350 motor. What I would like to know is how difficult the swap is. What parts will I need to do the swap. Keep in mind that I want to keep the fuel injection on the motor. Is there any prep work I can do with the 258 still in the jeep to make the swap go easier. Is it worth swapping to the 350 or should I stick with the 258? All opinions and suggestions are welcome. Thank you in advance for your time.

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post #2 of 6 Old 07-25-2006, 10:40 AM
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1978 CJ7 
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Location: Lancaster
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not much you can do with the motor in

you will need a motor mount set up -- adapters for the motor to tranny -- might need new driveshafts or mod them

1978 cj-7 had since 1979
401 .030 over- full floating flat top pistons
crower solid cam 292 dur .500/.510 lift
turbo 400 tranny 2500 stall
model 20 transfer case
aj delux glass body
4" lift
dana 30 frount
dana 44 rear
4.56 gears
13.461 @ 92.45 mph on 37" super swampers on 1/4 mile
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post #3 of 6 Old 07-25-2006, 11:19 AM
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1980 CJ5 
Join Date: Nov 2002
Location: Newport News, VA
Posts: 12,285
A few things that quickly come to mind...

> Engine Mounts
>Maybe new tranny mount
>Adapter to mate engine/tranny
>Maybe a new tranny to handle stronger motor
>Conversion Radiator
>Conversion Headers or manifolds
>New exhaust
>New hoses
>New fuel lines to handle injection
>Fuel Pump matched to injection system
>Wiring Harness (either complete, splice in or do your own)
>Different driveshafts
>Maybe stronger axles
>Nuts and Bolts

.. that should get you started.

'80 CJ5 w/AMC360, T176, D44 w/Detroit 4.56, RE 4" YJ lift and 35s..

Lower 2


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post #4 of 6 Old 07-25-2006, 11:51 AM
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1986 CJ7 
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Location: michigan
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get a 700r4 tranny it will bolt up to the 350 and a dana 300 you will also need the wireing harness and computer from the doner vehicle .
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post #5 of 6 Old 07-25-2006, 12:03 PM
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1982 CJ8 
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Location: Boston Area
Posts: 3,598

Change the cam also, it is setup for RPMs and you will need low end torque for the trails.


Do it right the first time !
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post #6 of 6 Old 07-25-2006, 12:12 PM
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1986 CJ7 
Join Date: Aug 2004
Posts: 4,701
Do some searching & reading, get the swap manual from Advance Adapters. People have been swapping 350's into CJ's for *decades* so there's plenty of info out there. The LT1 is a little more complicated from a wiring standpoint but there are enough resources out there since 350 swaps into just about anything are pretty common that you can easily find places that'll setup your harness for you, burn custom ROM's, etc.

'86 CJ-7 Laredo: 4.2,T-999,D300,D30/D44,'94 YJ tub, full cage, Shrockworks rockers, OYR corners, AC,cruise,restored seats,3 tops,2.5" Superlift,F-T shackle reversal, RS9000x's,35" Dunlop Mud Rovers.
'83 Scrambler: time & money pit under construction with parts from CJ's,YJ's,TJ's,FSJ's,GM,Ford,IH,Honda,Toyota and a whole lotta aftermarket & custom stuff.
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