4.0 head differenc3s.. - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 09-14-2000, 04:39 PM Thread Starter
 
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4.0 head differenc3s..

Ok, I know that 94 and later 4.0 are more desirable (to most) due to the FI being Mopar rather than Renix, but is the head casting the same?
I am having trouble locating a newer head in my area, but have run accross several 91's that I turned down. My plan is to go with the 4.0 head on the 258 and run my Weber on the 258 intake manifold.
TIA,
Bob

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post #2 of (permalink) Old 09-14-2000, 05:15 PM
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Re: 4.0 head differenc3s..

If I remember right for the head you want a '91 and up. The early 4.0 engines are less desirable because of a supposed rod knock problem which has nothing to do with the head. The '91 head is the first year of the HO head and uses Mopar EFI and not Renix. Check Jaffer's site for more information.

'75 CJ5,258 w/Howell EFI,T18a,4.27's,33's,On-board air,Warn 8274
post #3 of (permalink) Old 09-14-2000, 05:18 PM
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Re: 4.0 head differenc3s..

If I remember right for the head you want a '91 and up. The early 4.0 engines are less desirable because of a supposed rod knock problem which has nothing to do with the head. The '91 head is the first year of the HO head and uses Mopar EFI and not Renix. Check Jaffer's site for more information. http://www.monsterslayer.com/jeep/

'75 CJ5,258 w/Howell EFI,T18a,4.27's,33's,On-board air,Warn 8274
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post #4 of (permalink) Old 09-14-2000, 07:41 PM
 
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Re: 4.0 head differenc3s..

Also- I belive the intakes and valves on the 91+ heads are better...but I could be mistaken

Restoring a '74 DJ-5C [img]/wwwthreads_images/icons/cool.gif[/img] It runs [img]/wwwthreads_images/icons/smile.gif[/img] and drives [img]/wwwthreads_images/icons/shocked.gif[/img] and delivers mail...well, 2 out of 3 aint bad [img]/wwwthreads_images/icons/wink.gif[/img]
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