I pulled apart my 98 XJ 4.0 engine only to find out the the number 6 cylinder has a crack. I am building a 4.7 stroker but now need a new block. I know I want a block with the "NVH" stamp. Can I use any 4.0 block whether from a GC, Wrangler or Cherokee? I believe the years with the NVH are 96-2000. Any preferences to either year? At a stand still until I figure this out and pick one up. Thanks.
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Which replacement block for 4.7 Stroker?
- Thread starter caztaz
- Start date
- Location
- Hammertown, USA
The mount points for things like motor mounts are not the same on every block.
You probably want to stick to a casting number 53020569 but I believe could also get by with 53008405.
You probably want to stick to a casting number 53020569 but I believe could also get by with 53008405.
Frank Z
NAXJA Forum User
- Location
- Colorado Springs
96 saw increased web thickness and the addition of the main bearing girdle.
bigdaddyjlove
NAXJA Forum User
- Location
- Atalanta
- Location
- Hammertown, USA
That 98 TJ block did not have the boss/hole for the knock sensor on your 90 XJ, nor the hole for the temp sensor that feeds the PCM which is located under the header to the rear of the knock sensor.
The 90 XJ block may work in a 2001, but in a 91-99 XJ would not have had the mounts for the coil.
Others have actual motor mount mismatches, I have encountered it a few times but never bothered to track down where the blocks came from (i dont break my phone out and start looking up casting numbers when I am dirty)
tbburg
NAXJA Forum User
- Location
- Scottsdale AZ
The coil mount bosses are on the head, not the block. it's the '00/01 head that is different. Even though they don't have the distributor, the '00/01 motors still have the dist. drive for the oil pump and cam position sensor(which is basically the bottom half of the distributor)
First, thanks for the replies and help. I thought about a sleeve but read that this can cause the other cylinders to become out of round with the rigidity of the sleeve which is why I was looking for a block. Without knowing enough about the sleeve it becomes a reliability issue for me. The cost to sleeve one cylinder is minor compared to buying another block. If still available, I can get a 2000 block for $200 or a 97 engine/trans for $350 but both are a couple hours away which adds to the cost. I know they are different casting numbers but I will assume either would be fine.
dave92cherokee
NAXJA Forum User
- Location
- Lynchburg, TN
I've also heard that some people like to use a renix block for the bigger strokers due to the thicker walls of the cylinders.
People sleeve engine blocks all the time, I have a 360 getting one cylinder sleeved in the shop right now(intake valve head broke off, big mess, cracked cylinder).
If your going to have the other cylinders bored then the out of round won't be an issue anyways. I would sleeve it, much less hassle, and its a proven fix.
If your going to have the other cylinders bored then the out of round won't be an issue anyways. I would sleeve it, much less hassle, and its a proven fix.
