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  #1  
Old April 19th, 2012, 12:13
200SportXj's Avatar
200SportXj 200SportXj is offline
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Difference in 4.0l Blocks per year?

Im looking to build a stroker motor for my xj, I went on craigslist and found a complete 1987 4.0l block.

From what I understand that is the very first year of the 4.0.

My question is, is the actual block identical? and can all my accessories/intake manifold/header/head bolt onto this older block.

I have a 2000 xj with a 4.0 that runs fine, so i just wanna build the 1987 in the garage and throw it in someday.

I know the connecting rods were a hair different because they moved the pin location. But i know they are both 242 cid from 1987-1992 and then 93-97 was 242 non HO, then 98-01 was the HO version which is just a different intake manifold and diff header design.

Fill in the blanks for me, thanks!
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  #2  
Old April 19th, 2012, 14:44
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Re: Difference in 4.0l Blocks per year?

You will be better off with a newer block with noise and vibration improvements - check this link for a complete rundown on blocks, heads, cranks, and rods:

http://www.fourwheeler.com/techartic...six/index.html

Anorg stroker links:

http://www.angelfire.com/my/fan/stroker.html

Blocks:
Year............Casting No
1987-90......53005535 (8933002665)
1991-95......53008405
1996-98......53020569
1999-04......53010449

The main webs of the '96 and later blocks were stiffened with extra ribbing and a main bearing girdle was added to reduce noise, vibration, and harshness (NVH), making these the best blocks to build upon. All Jeep 4.0 blocks have a deck height of 9.450-9.456".
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  #3  
Old April 19th, 2012, 15:49
.dotfortune .dotfortune is offline
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Quote:
Originally Posted by 200SportXj View Post
But i know they are both 242 cid from 1987-1992 and then 93-97 was 242 non HO, then 98-01 was the HO version which is just a different intake manifold and diff header design.
Just to get ypu some correct info, both my 96's are HO motors. And 96 is the first year for the increased webbing.

Good Luck too!
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  #4  
Old April 19th, 2012, 17:52
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Re: Difference in 4.0l Blocks per year?

but this doesnt answer one of my questions which was, will all my accesories bolt onto it?

Like my HO intake manifold, newer headers, newer head?
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  #5  
Old April 19th, 2012, 19:56
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Re: Difference in 4.0l Blocks per year?

short answer yes they will
and you will get MORE displacement (only slightly) because the stroke is longer
Read the wikipedia article on the 4.0
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  #6  
Old April 19th, 2012, 20:38
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Re: Difference in 4.0l Blocks per year?

Quote:
Originally Posted by Tacedaddy View Post
short answer yes they will
and you will get MORE displacement (only slightly) because the stroke is longer
Read the wikipedia article on the 4.0
Bore and stroke are the same...........
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  #7  
Old April 19th, 2012, 22:37
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Re: Difference in 4.0l Blocks per year?

I was offered a modern short block (had coils on plugs) for like $150 from a xj. It should fit right in my 88 xj i guess
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  #8  
Old April 20th, 2012, 01:35
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Re: Difference in 4.0l Blocks per year?

ya u might hit a few snags with wiring of electronics tho.
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  #9  
Old April 20th, 2012, 02:39
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Re: Difference in 4.0l Blocks per year?

Quote:
Originally Posted by 88_cherokee View Post
I was offered a modern short block (had coils on plugs) for like $150 from a xj. It should fit right in my 88 xj i guess
All the bosses are different on 01 blocks
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  #10  
Old April 20th, 2012, 04:35
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Re: Difference in 4.0l Blocks per year?

Quote:
Originally Posted by 200SportXj View Post
ya u might hit a few snags with wiring of electronics tho.
When doing a cross-year swap, you use the vehicle's electronics like dizzy, flywheel, manifolds, sensors.
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Old April 20th, 2012, 04:36
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Re: Difference in 4.0l Blocks per year?

Quote:
Originally Posted by H8PVMT View Post
All the bosses are different on 01 blocks
Think they are on the 2000s, too.

I know for sure you can go to 1999 with minor adaptations.
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  #12  
Old April 20th, 2012, 06:10
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Re: Difference in 4.0l Blocks per year?

Quote:
Originally Posted by H8PVMT View Post
All the bosses are different on 01 blocks
I don't think this is is true, so proof is required.

I do know that any 1991-2001 XJ or 93-98 ZJ engine block will interchange with any other. You simply re-use the flywheel (if required), manifolds, belt driven accessories, sensors, and head as needed on the donor engine block. I would think that the earlier blocks also interchange, I just don't have any threads to link to as proof.
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Last edited by Tim_MN; April 20th, 2012 at 06:16.
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  #13  
Old April 20th, 2012, 07:35
O-Gauge Steamer O-Gauge Steamer is offline
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Re: Difference in 4.0l Blocks per year?

Insofar as I am sure, the COP head is the big issue, not the block. But, that being said, I would choose a later block to get the extra (read needed) main bearing support.

The blocks changed sometime after '01 so that would make mounting the accessories a tad difficult... With the AC compressor on the Driver's side for instance.
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  #14  
Old April 20th, 2012, 15:27
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Re: Difference in 4.0l Blocks per year?

Well im picking up the block regaurdless, its worth 50$ in scrap alone prolly. at 10 cents a pound and it weighing 500lbs. Ill figure it out once i get it in my hands on tuesday and ill document and post pics
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  #15  
Old April 20th, 2012, 20:28
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Re: Difference in 4.0l Blocks per year?

Quote:
Originally Posted by cruiser54 View Post
Bore and stroke are the same...........
YOU ARE WRONG

The displacement differs between 1990 and 1995 and 1996–2006 4.0L engines by 2 cubic inches. Both had a bore of 3.88 in (99 mm), while the stroke decreased slightly from 3.44 inches (87.38 mm) on the earlier engine to 3.41 inches (86.61 mm) on 1996 and later engines.

GFY
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