258 Engine Design Change - JeepForum.com

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post #1 of 7 Old 05-20-2008, 06:38 PM Thread Starter
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258 Engine Design Change

Hey folks. I was wondering if there was a design change in the engine or rather the head after the 1980 model year for the CJ 258 straight 6 engine? The reason I'm asking is that I am wanting to buy a new aluminum valve cover and most all of the stores sell them for the 1981 model year and up but not for the 1980 model like I am wanting. Can someone clear this up for me?

1984 CJ7, 258, T176, Dana 300-A Work In Progress
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post #2 of 7 Old 05-21-2008, 04:54 AM
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There is a difference but I don't have much insight.. I had a new valve cover gasket for an '85 that was part of a gasket kit I had purchased while re-building my motor. It would not fit. The edges were basically to "straight". So I went to the local parts store and had them pull out different gaskets for the various years. I had to go back to a 1980 to find the right one.

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post #3 of 7 Old 05-21-2008, 07:07 AM
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I believe 1981 and newer had different head bolts, and had a different valve cover pattern on the top. Someone correct me if I'm wrong...

1986 Jeep CJ7 4.2L I6 T176 (restoration in progress)
1961 Willys 4x4 Wagon L-226 I6 T90 (restoration also in progress)
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post #4 of 7 Old 05-21-2008, 07:37 PM
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Maybe you cover is rocker bridge stud, two nut mount through the top of the valve cover?
Most new aluminum covers I've seen are into the head six bolt affairs.
Just a guess
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post #5 of 7 Old 05-21-2008, 07:54 PM
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1983 CJ7 
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Well, i have an 80 and when I went and got a valve cover gasket the original one I got for the 80 was straight down on both sides, well when I took the cover it would not work, the side towards the carb had a bunch of curves. I had to get one for an 82 and still had to cut off alittle to make it fit. Not sure of the actual engine yr or what/if any part have been swapped out.

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post #6 of 7 Old 05-21-2008, 09:31 PM
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I have an 81 and it uses the old style without a gasket. It said to use RTV
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post #7 of 7 Old 05-22-2008, 09:14 AM
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79 was the cut off for the factory metal vavle cover. When I built my engine I swapped an 83 for a 79.
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