4.7 HO head gasket ? - JeepForum.com
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Unread 12-18-2010, 09:40 PM   #1
scottw1215
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4.7 HO head gasket ?

i have a 04' 4.7 HO Jeep Grand Cherokee with head gasket problem . Thinking about shaving the heads and was wondering how much can be taken off if any?

Thanks

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Unread 12-19-2010, 08:16 AM   #2
MrBaz
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HO already runs 9.7:1. You sure you want to up the compression?
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Unread 12-19-2010, 08:34 AM   #3
hxcjohnny
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you could have them decked, just to make sure they're true, then just run a thicker headgasket right?
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Unread 12-19-2010, 10:17 AM   #4
outlaw30
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depends on how bad they're warped. If it was a bad overheat, I doubt you'd be able to deck them and get a thick enough head gasket to keep the comp ratio close enough
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Unread 12-19-2010, 12:30 PM   #5
billzcat1
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The 4.7HO runs fine on regular at 9.7:1. I would bet with a slight decking you would be fine but would have to run premium all the time.
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Unread 12-19-2010, 07:41 PM   #6
MrBaz
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Quote:
Originally Posted by billzcat1 View Post
The 4.7HO runs fine on regular at 9.7:1. I would bet with a slight decking you would be fine but would have to run premium all the time.
Most people get knock with regular on the HO. It 'runs fine' because it retards the timing due to the knock sensors and gives you less performance. Midgrade or higher is required for best performance.
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Unread 12-19-2010, 08:23 PM   #7
WiCkeDuDe
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I just rebuilt a HO and took 5 thousands off the deck. It only bumped it up to about 9.8, which is nothing. My other 4.7 I built up at 10.5 to 1 and it wont even run on premium without alot of work. Airram.com has the cometic head gaskets and can get any width you need, but they are PRICEY. Just shaving the heads a bit or the block wont due enough to warrant head gasket changes though.
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