H.O vrs non H.O 4.0L engines - JeepForum.com
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post #1 of 3 Old 03-16-2007, 11:31 PM Thread Starter
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H.O vrs non H.O 4.0L engines

Ok guys I know this question has been knocked around before. I have decided to just find a good replacement engine for this 90' XJ 4x4 I have. It is just a play truck but I need it reliable. I have looked and called around to find a motor and it seems that non-ho motors are rare to find with good miles. There is a shop near me that sells used engines and they have a 95' 4.0L engine. These engines do not come with the intake, acc, exhuast manifold, etc. How much different is the H.O head? If I were to buy this motor will my 90's non H.O intake fit right up???

If the intake wont fit wil,l the non-ho head from my current 90' engine fit the H.O engine block?

I am not really looking for performance here, just reliability,

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post #2 of 3 Old 03-17-2007, 12:16 AM
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I'm pretty sure the Renix head will bolt up to the 95 block and then all of the stock Renix stuff will bolt up.

The only thing I would be concerned with would be the knock sensor. Not sure is the 91+ blocks had the bung to mount the sensor to.

Have you considered having your engine rebuilt? Granted the price will be more, but this way you'd have a new engine and not a second one with miles on it.

Depending on your budget, www.quadratec.com sells new long blocks for around $1600 with free shipping.

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post #3 of 3 Old 03-17-2007, 08:41 AM
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1989 XJ Cherokee 
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Originally Posted by balloo93
I'm pretty sure the Renix head will bolt up to the 95 block
You are correct. But why keep it Renix when you can now easily convert it to the HO system?

My Stroker uses a '89 block with a '95 head. The Renix blocks are stronger than the HO blocks.
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