4.0 head onto a 4.0 block - water jacket holes? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 07-15-2007, 04:16 PM Thread Starter
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4.0 head onto a 4.0 block - water jacket holes?

A friend just called - he had a carbed 4.2 head on a 4.0 block, but now is installing a 4.0 head with the stock FI system.

I'm too far away to see it -
He says the head gasket he has that's supposed to fit 4.0's does NOT have holes for the water to get up to the head. But both the head and block have the holes that match up! What gives? Chinese cheapie gasket?

Doesn't make sense!

Any info?
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post #2 of (permalink) Old 07-15-2007, 05:12 PM
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Could he have gotten a 258 gasket set?

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post #3 of (permalink) Old 07-17-2007, 07:34 PM
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i should have posted this eariler but a was still kinda trying it before you guys laughed at me......



I took a 2000 4.0L block out of a cherokee and installed my head, intake,2100 motorcraft carb, header, and HEI distributor !!! i had to have the head gasket for the 4.2. all the front brakets bolted right on maybe a few washers to shim!!! the other minor problem was the thrust bushing!!! the 4.0 was a automatic. when i went to auto china to get one, of course they said "there a bearing now"!!! so i bought a new thurst bushing for a 4.2 and turned it down to fit.

All i have to say about this hilbilly rebiuld is it was very cheap and now i have a very stong engine with 36,000 miles on it!!!!

I ask a few noteable motor heads about this, 1/2 of them told me it wouldn't work, the other half said I made a stroker out of it!!!!

I've been wheel'in it for 1200 miles and no problems so far!!!

Like i said this made alot more power then the ole 4.2 this winter when we have more time, and it's cooler were gonna take it all apart if it all looks good then were buidin alot of these monsters!!!!

Tim

Why is it that after you get stuck everyone helps you out then tries to make it though the same spot???

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03 TJ 4" lift 33" tires more mods to go !!!!!!!
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post #4 of (permalink) Old 07-18-2007, 01:23 AM
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I ran a 4.0 head on a 4.2 block for 3 years on my wifes Cherokee....the only reason for changing it out was because the 4.0 head was leaking oil down the valve guides...otherwise it ran fine.
.
The water jackets are blocked off on both the 4.0 and 4.2....except for material and gasket thickness, there is not a whole lot of difference....but if my feeble memory serves me correctly the 4.2 is a metal gasket and the 4.0 a composite/metal type.

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post #5 of (permalink) Old 07-18-2007, 01:50 AM Thread Starter
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It doesn't make sense that both engines have the water jackets blocked off.

This now is a straight 4.0 - block, heads, FI - everyhing.
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post #6 of (permalink) Old 07-18-2007, 04:15 AM
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Seems like I went through the same thing a few years ago and found that one brand of gasket was made diffrent tha another. When the 4.0 head goes on the 4.2 yro hae to weld up some holes in the head, and there are a couple blocked off water jackets but I cannot remember the details. Jaffer had a good writeup that compares the heads but I cannot find it now. It was on monsterslayer.com, but It was gone from the bookmark I had for it.

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post #7 of (permalink) Old 07-18-2007, 08:33 AM
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I have Tim Weaver's 4.0L head conversion files in PDF Format if anyone want's them... shoot me an email and I'll email them to you (400K).

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post #8 of (permalink) Old 07-18-2007, 09:06 AM
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Something about a new server changed the addresses of Jaffer’s pages.

Here is his home page. Some of the links there don’t work either.


The new addresses are
http://www.monsterslayer.com/Pages/


You have to add the www. before monsterslayer.com and /Pages after an old link to make it work.

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post #9 of (permalink) Old 07-18-2007, 09:21 AM
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Is this what you were looking for?

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post #10 of (permalink) Old 07-18-2007, 09:39 AM Thread Starter
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That's a good article. All well and good for a 4.0/258 conversion.

But - this one -
It did have the 258 at one time, but the block died.

He put in a 4.0 block using the 258 head and carb. He ran it like that for a couple of years. (Just the opposite of the article.)

Now he's got a 4.0 head and FI - which puts the engine back to stock original configuration - like a bone stock 4.0.

4.0 block, 4.0 head.

But he says there are not any holes in the stock head gasket to let water up to the head.

Is that right? Doesn't the 4.0 head get any cooling?

Why would the factory bother making water jackets if they aren't to be used?
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