79 j10 258 into my 86 CJ7 - JeepForum.com
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Unread 05-08-2013, 07:19 PM   #1
Registered User
1986 CJ7 
Join Date: May 2013
Location: Lake Geneva, WI
Posts: 2
79 j10 258 into my 86 CJ7

Has anyone out there put an older 258 into a newer CJ7? I can get a rebuilt j10 258 motor on the cheap with only 200 miles on it to replace my 86 258 with 143k on it. Is it a hard swap, or can it even be done?

TheCrusher is offline   Reply With Quote Quick reply to this message
Unread 05-09-2013, 01:07 AM   #2
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1981 CJ5 
Join Date: Aug 2009
Location: Delta, Colorado
Posts: 89
Unsure about the j10 258 but the older CJ 258 will mount right in. I can't imagine AMC making them much different. You will want to use your intake an exhaust manifolds though. The newer manifolds will be set up for elect choke, heater, ect. I believe you will have to lengthen your wire for the elect temp sending unit. On newer engines the sender is at the back of the head older ones its at the front.
Hope this helps.

Sent from my DROID RAZR HD using JeepForum
81 CJ5 258/T18/dana20/ARB locked diffs/33's
80 CJ7 258/auto/d 44 diffs/ 4" lift/rebuild started 80 CJ7 #2 stock(sold)
82 CJ7 stock DD
CJuncky is offline   Reply With Quote Quick reply to this message

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