Simple quick question: I need a new engine for my 89 4.0 but low mileage Renix engines are hard to come by. So I was thinking about getting a HO 4.0 and putting my intake and exhaust on it so I wouldn't have to do the TPS mod and swap anything out. Will they fit onto the ports on the head without any trouble?
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Renix Intake to a HO head
- Thread starter RyleyF
- Start date
Not much increase in power but it was some. Even if he got the full benefit of the HO it would only be 13hp as far as stock stuff goes. So take into consideration that the intake is the renix and the ports are not matched all the great I think you might gain 5hp lol.
BIGSLVRXJ
NAXJA Forum User
- Location
- Des Moines, Iowa
I've done just the opposite of you, I have run an HO intake on a Renix head. It will run okay and although the ports are, as mentioned above, pretty mismatched, I'd say go for a newer, low mileage HO and call it a day.
xjjeeper19
NAXJA Forum User
- Location
- inland empire, ca
RenixPower said:
Are you talking about the ports on the head I/E? I have a 93HO head on my renix block, I just used the older renix intake gasket....runs fine
DirtyMJ
NAXJA Forum User
- Location
- Prince George, BC
Can a guy port match them with a die grinder? Or is it way bad mis-matched?
TRAILREADYXJ
NAXJA Forum User
- Location
- Raleigh NC
I put a 93 motor in my 90 using the renix intake with no problems. The ports may be off a hair, but they both called for the same gasket. I also noticed a fair increase in power, but my old motor was pretty tired.
BIGSLVRXJ
NAXJA Forum User
- Location
- Des Moines, Iowa
No, I'm talking intake on head, not head on block.xjjeeper19 said:
xjjeeper19
NAXJA Forum User
- Location
- inland empire, ca
RenixPower said:
I'm running the renix intake, and i had no problems....as stated above.....they both use the same gasket (renix&HO) the gasket did change till 2000-2001 I think.
RWKHausSupply
NAXJA Forum User
- Location
- yorba linda, Cali
TRAILREADYXJ said:
Wrong Info..
Correct Info for those that are interested is that
THEY DO TAKE TWO DIFFERENT GASKETS! And they are off Alot more then a hair.
Renix Felpro # MS93680
HO Felpro # MS94790
Will either intake work on the other, usually yes. Will there be leak issues, possibily. There are people that have had and some that have not had issues.
I saw run the Correct fitment and be sure.. Just my opinion...
TRAILREADYXJ
NAXJA Forum User
- Location
- Raleigh NC
Well then good ol' Advance Auto gave me a renix gasket when I asked for a 93 gasket because they were exactly the same.
RWKHausSupply
NAXJA Forum User
- Location
- yorba linda, Cali
TRAILREADYXJ said:
I believe that they list the same gasket because the triad system that lists the part interchange and fitment was prolly wrong. BUt if you look at your / renix head and intake, intake port shape, it will match the 93680 (renix) gasket.
But its prolly going to be ok in saying though that you might never have a leak or issue. Only If you tried to use the Renix yr fitment gasket on the HO you would have about 15% of the port with gasket blocking it.
Slo-Sho
NAXJA Forum User
- Location
- The 2nd most regulated state.
This is what a 99+ intake looks like on a '90 head. You can see on the upper right port where the top of the head blocks off at the manifold. After I swapped in the ported 99 head it was night and day difference in the power department.
BIGSLVRXJ
NAXJA Forum User
- Location
- Des Moines, Iowa
That is correct, and it just so happens, if you want it, I have Hesco's TPS adapter so you can run the Renix TPS on the HO throttle body. This kills the idea of any jerryrigging going on, it is truly the proper way to do it. Contact me backchannel if you're interested RyleyF.RyleyF said:
IH392
NAXJA Forum User
- Location
- Oakdale, CA
There is a small section on top of the intake port that will not overlap at the two mating surfaces, so I had to raise the intake manifold 3/16 of an inch by notching the dowel holes on the intake. I also ported the HO head to match the renix intake because lifting the intake really messed the alignment of the ports. A real PIA, but I had to keep the EGR valve for smog.
Ok this thread is now about putting a 98 4.0 into my 89 
I'm trying making a mental list of things that I need to make sure everything goes smoothly and I'm feeling a bit better about it.
Does anyone know if the ~98 4.0 (I say around 98 because I'm not 100% that it is a 98) has a provision for a knock sensor?
I'm trying making a mental list of things that I need to make sure everything goes smoothly and I'm feeling a bit better about it.
Does anyone know if the ~98 4.0 (I say around 98 because I'm not 100% that it is a 98) has a provision for a knock sensor?
BIGSLVRXJ
NAXJA Forum User
- Location
- Des Moines, Iowa
Yes it will have a hole, whether the threads are there, is a gamble. The worst case is you'll have to tap that hole out, but that's not too bad of a job. Chances are though, the threads will be there already. They are on the 99 engine I just picked up.RyleyF said:Ok this thread is now about putting a 98 4.0 into my 89
I'm trying making a mental list of things that I need to make sure everything goes smoothly and I'm feeling a bit better about it.
Does anyone know if the ~98 4.0 (I say around 98 because I'm not 100% that it is a 98) has a provision for a knock sensor?
