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Old 11-20-2014, 07:28 PM
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258 6 Cylinder Question.

Can someone tell me if all in line 258 6 cylinder 4.2 engines are the same. My 258 blew a head gasket and wound up with a cracked head. I've got a chance to buy a newer 258 with 89.000 miles for $200. I just want to make sure it will fit in my 1980 CJ7. I believe the newer 258 is a 87 year. Any advice will be greatly appreciated.

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Old 11-21-2014, 05:29 AM   #2
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From 72 to 1990 yes

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Old 11-21-2014, 07:40 AM
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Thank you very much!
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Old 11-29-2014, 06:39 AM   #4
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there are a few differences, mostly in the head. head bolt size changed, different valve cover. the 87 could be serpentene belt, they made both that year. intake manifold is different.
1987, 4,2, rebuilt, head casting cleaned up, port matched and milled-9.5 compression, hotter cam holley 4 bbl
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Old 11-29-2014, 08:23 PM   #5
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I loved my 89' 4.2 motor. Mine had a rebuilt 2bl. Carter carb. that worked great, but that's not the norm. If your 4.2 in 87' has the Carter 2bl. You should do a search for a motorcraft or weber. Lots of info. in the YJ section, or use the search tool! Good luck, with your swap.
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