How do I identify if a 4.7 is HO or not? - JeepForum.com
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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WJ Grand Cherokee Forum > How do I identify if a 4.7 is HO or not?

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Unread 06-11-2012, 06:13 PM   #1
Gru
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2003 WJ 
 
Join Date: Jun 2012
Location: Tecumseh, Oklahoma
Posts: 18
How do I identify if a 4.7 is HO or not?

I am likely going to have an extended warranty replace the engine in my 03 Overland. Just to make sure everything is as it should be, I am wondering how I would tell a 4.7 HO from a non HO.

Also, if this is coming from a wrecked Jeep, is there a certain vintage 4.7 HO I should avoid? For example; anything pre 2001? Considering they are probably going to go by mileage, is there a later year that might be better than a 2003? I would assume not because 2005 was the Hemi, right?

I suppose I am looking for something like a block stamp.

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Unread 06-11-2012, 06:21 PM   #2
narnwv
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2000 WJ 
 
Join Date: Sep 2009
Location: Cross Lanes, WV
Posts: 6,239
If they don't use an HO engine, they'll have to swap wiring harnesses and PCMs, as the standard 4.7 doesn't have the 2 knock sensors.

To triple check, there will be "H.O." in the casting of the heads.

H.O. 4.7 didn't appear until 2002, and wasn't put in anything beyond the 2004 WJ to my knowledge. There were updates to the 4.7 for the WK (2005+), but no H.O. engine.
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Unread 06-11-2012, 06:32 PM   #3
Gru
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Join Date: Jun 2012
Location: Tecumseh, Oklahoma
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Perfect!
Just what I was looking for.
Thank you narnwv.
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