4.0 i-6 DIFFERENCES?

[cruiser54]

I just did it in my garage tonight. Bolted a 7120 head on a Renix.

 

[bails85]

did you run into any complications at all or was direct bolt on? are you going to use the renix intake manifold or the h.o. manifold that came with head?

 

[gradon]

Main issue is getting the renix TB to mount on the 99+ intake manifold or getting the renix TPS to adapt to the HO TB. You don't want to go through the trouble of adding the 99+ intake if you're gonna keep the poorer flowing 2686 renix head. The other issue is that you'll need a 96+ power steering bracket/tensioner combo in order to use the 99+ intake(has different mounting bolts for the ps pump). 91-95 7120s will have the port for the cts that feeds the dash gauge in renixs. Some 96 0630s have the port(my 1/96 does), but 97-99s 0630s do not. You can always extend the single conductor wire and tap the T-stat housing to install the sensor if you come across a good deal on a 97-99 0630 head.

 

[gradon]

Main issue is getting the renix TB to mount on the 99+ intake manifold or getting the renix TPS to adapt to the HO TB. You don't want to go through the trouble of adding the 99+ intake if you're gonna keep the poorer flowing 2686 renix head. The other issue is that you'll need a 96+ power steering bracket/tensioner combo in order to use the 99+ intake(has different mounting bolts for the ps pump). 91-95 7120s will have the port for the cts that feeds the dash gauge in renixs. Some 96 0630s have the port(my 1/96 does), but 97-99s 0630s do not. You can always extend the single conductor wire and tap the T-stat housing to install the sensor if you come across a good deal on a 97-99 0630 head.

 

[cruiser54]

did you run into any complications at all or was direct bolt on? are you going to use the renix intake manifold or the h.o. manifold that came with head?

I 'm using the Renix manifold and gasket.

You don't have to, but I match the ports on the HO head to the Renix gasket and eliminate the little lip. Probably don't need to as many others have done this swap without doing it.

 

[sjx40250]

I believe the Renix era blocks had higher nickel content and did not wear as rapidly, not that any really wear rapidly!

 

[Ghost]

I believe the Renix era blocks had higher nickel content and did not wear as rapidly, not that any really wear rapidly!

I have also read about something called an mexican block that the jeepspeed guys use. I think it is a thinker casting or somthing alonethose lines.

 

[cruiser54]

I have also read about something called an mexican block that the jeepspeed guys use. I think it is a thinker casting or somthing alonethose lines.

I heard of that Mexican block, too. Years ago, when the guy from Jeep Racing lived here in town and I was service manager at the local dealership, he built a supercharged 4.5 or 4.6 2WD Comanche. He said they used the Mexican block.

I remember reading somewhere that the Mexicans got a 4.5 as standard equipment. Never followed up on it.

 

[bails85]

so im kinda confused here. stroke the renix block use the 7120 head and the 91-95 intake manifold but i have to port match them. is this smog legal in ca? i thought that the renix manifold has the egr and the newer ones dont.

 

[cruiser54]

Renix has EGR. 7120 head does not need to be port matched to a 91 through 99 manifold.

If you wanna run a 7120 head on a Renix vehicle in California, you would need to use the Renix manifolds, TB, and all sensors to be legal. Match porting isn't absolutely necessary but I do it. For added performance and flying under the radar of the emission police, you could get a 60mm bored TB from www.strokedjeep.com . Nobody would know but you.

 

[4.6strokedMJ]

so, i have built a 4.6 to go into my 90 MJ, but the block and head for it is out of a 93 HO cherokee. as far as i know i dont see why you couldnt bolt the head off an HO to a regular 4.0 but you may want to ask your local machine shop guy

 

[cruiser54]

The heads arew interchangeable. The intake ports are somewhat different.