Heads
03-03-2012, 11:01 AM
#1
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Year: 1992
Model: Cherokee
Engine: 4.0
Heads
So im in a diesel tech school and one of the classes is rebuilding heads. well since i dont have a diesel and a gas head is virtually the same as a diesel head in components, im allowed to bring in a gas head to rebuild. im wondering if a later model 4.0 head will fit on my 92 xj with NO mods. bolts right on. will it? and is there any perks to trying to put a newer model head on my 4.0 or should i just find a head off a 92 xj?
03-04-2012, 11:10 AM
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Year: Jeepless at the moment
2000+ heads will require a new exhaust IIRC. 96-99 will be bolt on,with the exception of the temp sensor on the back of the head, some/most 96s have the hole for it, but you can get a new tstat housing with two ports for the sensor, you will have to extend the wires.
03-04-2012, 05:25 PM
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Originally Posted by fishtaconc
Some say the 7120 head('91-95) is the best head put on the 4.0. To answer your original question, any 4.0 head will bolt on.
03-06-2012, 06:17 PM
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Year: 1992
Model: Cherokee
Engine: 4.0
on the 7120 heads, are they prone to cracks or anything else i should be looking out for when i go to a jy to pick one up?
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03-24-2012, 04:01 PM
#8
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Year: 1992
Model: Cherokee
Engine: 4.0
So i bought a 4.0 head today. its only got 160K on the motor but the jeep was rolled. its a NON HO head. Will it still work?? i guess i should have figured this out before i bought it
03-24-2012, 04:48 PM
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Int/Exh ports, you will need to use the manifolds from the renix(non HO) vehicle. I know it was only 8hp difference between the renix/ HO engines, but with the tunes of the engines I dont know if it will be worse,better. If it were me I would try to sell it and find a HO head. Maybe you could PM, Cruiser54 , he knows a lot about the renix engines.
03-24-2012, 04:55 PM
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Year: 1998
Model: Cherokee
Engine: 4.0
i blew up a 94ho and swapped in a 88 4.0 block and head and used the intake manifold off the 94 not that this completly helps but i do know u can basically do the opposite of what your trying
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