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factory head swaps?

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Old 04-08-2012, 01:11 PM
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Default factory head swaps?
Any one ever put a 4.0 H.O head on a regular 4.0
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Old 04-08-2012, 01:47 PM
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Sure. Why?
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Old 04-08-2012, 02:10 PM
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Originally Posted by cruiser54
Sure. Why?
HAA HAAA HAAAA!
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Old 04-08-2012, 03:04 PM
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Originally Posted by cruiser54
Sure. Why?
there's a direct answer for ya. Hahaha
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Old 04-08-2012, 03:07 PM
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it won't make it a high output tho.
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Old 04-08-2012, 04:34 PM
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Originally Posted by caged
it won't make it a high output tho.
Sure won't. The exhaust manifold on an HO is better flowing and the throttle body is larger. Cam is the same through 95 or so.
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Old 04-08-2012, 06:14 PM
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Just wondering cause I just bought a 1990 and it don't have the H.O. in it and I've got all the parts for a HO FROM A 1995
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Old 04-08-2012, 06:25 PM
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nope. you can't turn the renix into an h.o.
it's all about the computer with those parts.
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Old 04-08-2012, 06:34 PM
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Ok thanks for the info guys what about intake,throtlebody,and exhaust manifold swap onto the renix
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Old 04-08-2012, 08:39 PM
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Originally Posted by xj 95
Ok thanks for the info guys what about intake,throtlebody,and exhaust manifold swap onto the renix
You can put that HO into your Renix. Just use your intake and exhaust manifolds along with the intake/exhaust gasket for your Renix. Be sure to use your distributor, valve cover, and flywheel/flexplate from the Renix. I've done this a few times. No big deal.
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Old 04-09-2012, 07:15 AM
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sorry, i meant yes you can install those parts, but no it won't make it an H.O.
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Old 04-09-2012, 07:47 AM
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Originally Posted by caged
sorry, i meant yes you can install those parts, but no it won't make it an H.O.
I understood you.
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Old 04-09-2012, 09:49 AM
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Is it worth all of that work for an extra 13 hp at the most? I'd leave it unless you plan on rebuilding it or putting in a stroker.
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Old 04-09-2012, 02:49 PM
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Originally Posted by jeepkid03
Is it worth all of that work for an extra 13 hp at the most? I'd leave it unless you plan on rebuilding it or putting in a stroker.
The HP gain with teh HO head is all in the upper RPM ranges. Torque is the same Renix to HO.

HO got some, but not all, of it's roughly 10 HP from the head design. Just as much came from the throttle body being 58mm versus 52mm on a Renix and the fact the HO had a better flowing exhaust manifold than Renix.

HO was an excellent marketing scam by Chryco.
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Old 07-01-2019, 04:38 PM
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Default Casting head swaps
Originally Posted by cruiser54
I understood you.
Originally Posted by caged
sorry, i meant yes you can install those parts, but no it won't make it an H.O.
I have a 98 Cherokee W an 0630 head casting can I replace the head W a 7120 casting head?
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