did i buy the right head? - JeepForum.com
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post #1 of 4 Old 09-27-2013, 06:10 PM Thread Starter
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1997 XJ Cherokee 
Join Date: Jul 2013
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did i buy the right head?

So took my head into a machine shop and had them test it. Said it was cracked.
Went to a scrap yard and found a engine that looked just like mine. $100 later and I was at home stripping it apart.
While I was taking it apart I could see small differences. Power steering pump mounted differently onto the intake. Head bolts were regular 6 point not 12 point like in my 1997, and I think the AC bracket was sort of different.

My jeep is a 1997 jeep Cherokee sport with the 4.0l i6 engine
This scrap yard engine I'm not sure on the year. Pretty sure its older. Its a 4.0l and fuel injected and has the distributor just like mine.
These are the cast markings I found on the block. Hope it helps identify what year and if its the same as mine.
15 93

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post #2 of 4 Old 09-27-2013, 07:40 PM
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It is my understanding that the heads are compatible with one another.

However, the intake manifolds have changed slightly up to '99 the manifold used on '99-'06 is much more free flowing. It has a curved shape instead of the boxy shape. Huge difference ill post some pics soon.

The intake manifold is what your power steering pump and brackets bolt to.

The head bolts should not matter in the number of points on the head as long as it is a head bolt the same length width and thread. DO NOT REUSE HEAD BOLTS. They are cheap enough to buy new.

And it looks like that engine was made in '93
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post #3 of 4 Old 09-28-2013, 12:12 PM
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Originally Posted by corcan1 View Post
That's a '91-'95 engine block. Check the head casting number, it should be 7120 on the '91-'95. The '96-'99 casting is 0630 which is slightly different from the earlier HO head. 7120 is compatible with your engine, but the intake/ exhaust flow rates are slightly better on the '96-'99 head (which is the best of all the HO- era 4.0 heads).

edit: I can't remember exactly if they started using the alignment pins on the engine block around '96 or '97 (or later?). Earlier heads don't have the holes drilled for the dowel pins. It's not a huge problem though, alignment pins are there to help head alignment when installing it.

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post #4 of 4 Old 09-28-2013, 10:27 PM Thread Starter
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1997 XJ Cherokee 
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Has 7120 on the head.
Great news, thanks guys.

Head is getting rebuilt and should have it back Monday.
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