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New Engine

Old 02-21-2019, 08:05 PM
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Year: 2000
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I currently need a short block for my 2000 XJ 4.0l. I've been told it's tough to find a short block for these and the best route is a full build/long block. Any suggestions on where to buy from and what to buy? Any mods worth doing to the new engine before dropping it in?
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Old 02-22-2019, 12:00 AM
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Originally Posted by PA_XJ View Post
I currently need a short block for my 2000 XJ 4.0l. I've been told it's tough to find a short block for these and the best route is a full build/long block. Any suggestions on where to buy from and what to buy? Any mods worth doing to the new engine before dropping it in?
finding short blocks isnít an issue from what Iíve seen ...... however ... Iíd reccoemend a good used engine over a rebuild every day of the week ..I think youíll get more people suggesting the same as well . Car-part.com will let you check local salvage yard prices ... they will negotiate FYI ... and Craigslist always seems to have someone selling a good running rusty XJ in my area . Good luck !
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Old 02-22-2019, 06:50 AM
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I'm pretty sure the reason is that the heads are prone to cracking. Therefore a long block with the updated head would be a good choice unless your engine already has the updated head.
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Old 02-23-2019, 08:09 AM
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Originally Posted by cruiser54 View Post
I'm pretty sure the reason is that the heads are prone to cracking. Therefore a long block with the updated head would be a good choice unless your engine already has the updated head.
yes it has a new head since we thought that was the issue which it was it was cracked but turned out a valve hung and smoked the cam
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Old 02-23-2019, 08:28 AM
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OK then:

XJ Cherokee and ZJ Grand Cherokee 4.0L engine blocks interchange.

2000+ TJ Wrangler and WJ Grand Cherokee 4.0L engine blocks interchange.

XJ/ZJ blocks, and the 2000+ TJ/WJ blocks DO NOT interchange without significant modifications. (1991 to 1995 YJ and 1997-1999 4.0L TJ Wrangler blocks will interchange in XJ/ZJ and visa-versa).

TJ/WJ 4.0L Engine blocks underwent clean sheet design changes effective in the 1999 WJ Grand and 2000 TJ Wrangler. These blocks are not interchangeable with XJ/ZJ engine blocks. The reason is motor mount bolt holes and belt driven accessory mounting bolt holes are in different locations, or not present at all, TJ/WJ vs. XJ/ZJ.


XJ: "Regular" (not Grand) Cherokees 84-01
ZJ: Grand Cherokee 93-98 (Gen1)
WJ: Grand Cherokee 99-04 (Gen2)
YJ: Wrangler 87-95 (Gen1)
TJ: Wrangler 97-06 (Gen2)
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Old 02-24-2019, 08:26 PM
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Napa makes the 4.0 with the TUPY head (obviously long block).....Its not a complicated build and you're not racing it. Just make sure it's with the TUPY if you order it.........ironclad 3 yr warranty
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